Motown Race-Prepped Block
Moderator: Team
Tolerances
Kevin
Who tolerances would you like Dart, World, or any other block maker to choose from??? Nobody has the same tolerances, and no companies dont make their parts to fit any particular engine block made. Tolerances vary across the scale and from manufacturer to manufacturer. You have to remember lifter makers have to make parts that fit a wide variety of parts, lets say you have a 39700010 GM four bolt block that has been in service for like 20 years, and you have it machined again. After the shop machines it and hones the lifter bores to straighten them out and such, that hole gets bigger so if the lifters are made smaller then they are too loose... As I have stated in the past here is some lifter specifications, GM lifter diameter is .842, a Comp lifter is .8412 +/-.0003, Crower is .8413-.8416, a GM hydraulic roller is .8425 +/-.0003. Our dimension is .8427-.8437, now if we are at the .8427and you use a hydraulic roller they are too tight. You see the dilemma, you CAN NOT premachine the block to fit everybodies parts. SCAT, EAGLE, CALLIES, all have different tolerances than say WINBERG, COLA, SONNY BRYANT etc. the lower cost items have more of a tolerance variance than a high end Winberg crank would. We cant build that in. We hone the cam tunnel, and supply the bearings, this is easy as cam journals are the same unless the camshaft is mismanufactured. I dont by that parts are made exact, if that were the case, engine builders wouldnt mic a piston prior to honing a block to set up the correct piston to wall clearance, nor would we have to install the crank, a rod and piston into the motor and check the piston in the hole measurement to determine how much to machine off the deck. We could do simple math if the parts were always the same, center to center of rod, pin to piston top etc.... It is impossible to build a block for racing, street strip, oval track, or whatever without doing any of these things. If you dont want to do that then running a stock block with some corrective machining and stocker parts then it should slap together without too many problems. Bottom line is there is no way for any company like Dart, World, GM, Brodix, or whoever else makes blocks to eliminate the engine builder/machine shop. Its just not possible unless we get into people sending us their parts to premachine their blocks and ship them back, and no, no, and heck no we dont want to do that.
Who tolerances would you like Dart, World, or any other block maker to choose from??? Nobody has the same tolerances, and no companies dont make their parts to fit any particular engine block made. Tolerances vary across the scale and from manufacturer to manufacturer. You have to remember lifter makers have to make parts that fit a wide variety of parts, lets say you have a 39700010 GM four bolt block that has been in service for like 20 years, and you have it machined again. After the shop machines it and hones the lifter bores to straighten them out and such, that hole gets bigger so if the lifters are made smaller then they are too loose... As I have stated in the past here is some lifter specifications, GM lifter diameter is .842, a Comp lifter is .8412 +/-.0003, Crower is .8413-.8416, a GM hydraulic roller is .8425 +/-.0003. Our dimension is .8427-.8437, now if we are at the .8427and you use a hydraulic roller they are too tight. You see the dilemma, you CAN NOT premachine the block to fit everybodies parts. SCAT, EAGLE, CALLIES, all have different tolerances than say WINBERG, COLA, SONNY BRYANT etc. the lower cost items have more of a tolerance variance than a high end Winberg crank would. We cant build that in. We hone the cam tunnel, and supply the bearings, this is easy as cam journals are the same unless the camshaft is mismanufactured. I dont by that parts are made exact, if that were the case, engine builders wouldnt mic a piston prior to honing a block to set up the correct piston to wall clearance, nor would we have to install the crank, a rod and piston into the motor and check the piston in the hole measurement to determine how much to machine off the deck. We could do simple math if the parts were always the same, center to center of rod, pin to piston top etc.... It is impossible to build a block for racing, street strip, oval track, or whatever without doing any of these things. If you dont want to do that then running a stock block with some corrective machining and stocker parts then it should slap together without too many problems. Bottom line is there is no way for any company like Dart, World, GM, Brodix, or whoever else makes blocks to eliminate the engine builder/machine shop. Its just not possible unless we get into people sending us their parts to premachine their blocks and ship them back, and no, no, and heck no we dont want to do that.
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We have premachined many blocks over the last 6 years for some top engine shops in this feild and have no issues as far as deck heights, lifter bore sizing and finish size of the cylinders and main lines. And so far in 6 years nothing has had to be returned for incorrect demensions.
And when we find cylinders out of blue print from intake to exhaust when this demension is off the piston is not directly over the crank center line making the piston set down in the hole and this is why when we blue print the block to where its suppose to be and using good parts the deck heights should be all the same.
And as you have stated before some times you have to move the cylinders to get everything to come out right which all we do is put them where thay are suppose to be. Thats why when most shops bore of the existing locations they may find a veraiance in deck heights over a block that has been blue print bored.
We have been doing premachined blocks for PCCW Engines out of VT. 802-457-3111 for 5 years now and they do alot high end engines as this engine in the pic ran at Concord Raceway in N.C. this weekend and was one of the top runners this weekend. And at IRWINDALE, Calif. there engines finished 1st, 3rd and 5th and the block in the pic is a Dart that has been lightened and fully premachined and honed by our shop. Give them a call and ask for Randy and ask them how our premachined blocks are working out for them.
Its hard to believe we can premachine blocks for other engines shops and engine builders and you guys can't. HMMMM VERY INTERESTING!!!!!!!
And when we find cylinders out of blue print from intake to exhaust when this demension is off the piston is not directly over the crank center line making the piston set down in the hole and this is why when we blue print the block to where its suppose to be and using good parts the deck heights should be all the same.
And as you have stated before some times you have to move the cylinders to get everything to come out right which all we do is put them where thay are suppose to be. Thats why when most shops bore of the existing locations they may find a veraiance in deck heights over a block that has been blue print bored.
We have been doing premachined blocks for PCCW Engines out of VT. 802-457-3111 for 5 years now and they do alot high end engines as this engine in the pic ran at Concord Raceway in N.C. this weekend and was one of the top runners this weekend. And at IRWINDALE, Calif. there engines finished 1st, 3rd and 5th and the block in the pic is a Dart that has been lightened and fully premachined and honed by our shop. Give them a call and ask for Randy and ask them how our premachined blocks are working out for them.
Its hard to believe we can premachine blocks for other engines shops and engine builders and you guys can't. HMMMM VERY INTERESTING!!!!!!!
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Same question as motorman
Carl where do you dream up these imaginary dimensions?? How do you determine stack height, how do you determine the correct bore size for the lifter, and without measuring the crankshaft how do you detemine the correct housing diameter??
As for we cant do it sure we can make up a generic size like yourself and sell it to people like that, however the other 99.9% of people in this world who use our blocks would like to machine them to match their parts!!
Are you not famliliar with offset boring something engine BUILDERS have been doing for 40+ years? This is done by boring the top side of the bore more than the bottom. This allows for more material to remain on the thrust side of the bore when boring?? So all the guys who have done this for 40 years are stupid??? Smoky Yunick, David Reher etc... I meen before aftermarket blocks were available this was how you got a big bore in a block without ruining the thrust sides integrity..
So if moving the piston .002-.004 will affect the location above the crank who cares. Most people prefer the bore to be centered to allow the most concentric consistent amount of material around the cylinder walls.
Look you have services that you feel are added value and justified. Sell it thats good for you. We are not in competition with you, we dont want to be a finish machine shop for blocks, we can, sure we can do it better than most.
oh and we build engines, have for over 40 years, so we know a thing or two about what we do Carl.
And did you ever think that the reason people who buy Dart blocks from you make power and the block last because it is a Dart block not what CARL the CNC guy did!!
As for we cant do it sure we can make up a generic size like yourself and sell it to people like that, however the other 99.9% of people in this world who use our blocks would like to machine them to match their parts!!
Are you not famliliar with offset boring something engine BUILDERS have been doing for 40+ years? This is done by boring the top side of the bore more than the bottom. This allows for more material to remain on the thrust side of the bore when boring?? So all the guys who have done this for 40 years are stupid??? Smoky Yunick, David Reher etc... I meen before aftermarket blocks were available this was how you got a big bore in a block without ruining the thrust sides integrity..
So if moving the piston .002-.004 will affect the location above the crank who cares. Most people prefer the bore to be centered to allow the most concentric consistent amount of material around the cylinder walls.
Look you have services that you feel are added value and justified. Sell it thats good for you. We are not in competition with you, we dont want to be a finish machine shop for blocks, we can, sure we can do it better than most.
oh and we build engines, have for over 40 years, so we know a thing or two about what we do Carl.
And did you ever think that the reason people who buy Dart blocks from you make power and the block last because it is a Dart block not what CARL the CNC guy did!!
I'm one of those guys running some older equipment. I'd have get an education to run anything that was CNC operated. I'm personally happy in the quality of the dart blocks I've seen. Granted I recheck everything just like I would a 40 year old block and make necessary corrections for my application. I can't think of a time where i told myself, "Wish they would have left more material here".
As a whole I'm very pleased.
As a whole I'm very pleased.
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Re: Same question as motorman
All the blocks we machine for other shops and engine builders have to fill out a spec sheet before we do anything to a block and we do only what they ask and no more and this has worked for the last 6 years with no returns and Don't argue with me I left a number you can call are with the guys that fill out the spec sheet as we do only what they ask for.JK@D wrote:Carl where do you dream up these imaginary dimensions?? How do you determine stack height, how do you determine the correct bore size for the lifter, and without measuring the crankshaft how do you detemine the correct housing diameter??
As for we cant do it sure we can make up a generic size like yourself and sell it to people like that, however the other 99.9% of people in this world who use our blocks would like to machine them to match their parts!!
Are you not famliliar with offset boring something engine BUILDERS have been doing for 40+ years? This is done by boring the top side of the bore more than the bottom. This allows for more material to remain on the thrust side of the bore when boring?? So all the guys who have done this for 40 years are stupid??? Smoky Yunick, David Reher etc... I meen before aftermarket blocks were available this was how you got a big bore in a block without ruining the thrust sides integrity..
So if moving the piston .002-.004 will affect the location above the crank who cares. Most people prefer the bore to be centered to allow the most concentric consistent amount of material around the cylinder walls.
Look you have services that you feel are added value and justified. Sell it thats good for you. We are not in competition with you, we dont want to be a finish machine shop for blocks, we can, sure we can do it better than most.
oh and we build engines, have for over 40 years, so we know a thing or two about what we do Carl.
And did you ever think that the reason people who buy Dart blocks from you make power and the block last because it is a Dart block not what CARL the CNC guy did!!
Call Paul Renaldy at New England Compitition engines as he buys alot of 010 blocks from us all machined except the finish honing of the cylinders and he sees a pretty good gain on the dyno using a CNC preapred bock over one thats done withhis fixtures. So I must be doing somthing right. But as far as what they come up for deck height and main bore demesions and lifter bore size call the guy who fills the spec sheet out Give him a call at 603-881-9995 As I beliveve I am dealing with a salesman from Dart and not a engine builder who owns a shop and equipment and does this everyday for living.
And I believe that guys make the same power using the Bow-tie blocks as the Dart blocks when they are prepared right.
And we have found on the worst Dart block the cylinder lacations off as much as .007 and one off the last blocks we did they were with in .002 pretty good.
And maybe having a cylinder out of location .002 to .004 is alright with you as you have mentioned before you have to move them to get things to come out right.
Don't get me wrong the Dart and the Bow-tie blocks are nice foundations to start with all we do is dial them in a little closer then factory machining.
We have a fixture for blue print boring the cam tunnels and this has been check out on a CMM machine its right on and when machining the Dart and Bow-tie blocks if my fixture was off and the Dart and the Bow-tie was right on would I be seeing the blocks of the exact same amount and in the same direction each time. Well I am not seeing that.
But again what are the tolerances you guys allow in machining your blocks?????????????
And having the capabilities to check blocks out is a must in this bussiness on the other hand if I did not have this capability I would on have to go by whats there and say its right on like most shops do.
Last edited by CNC BLOCKS on Tue Nov 15, 2005 11:30 am, edited 1 time in total.
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I run a small machine shop in the Pacific Northwest, we have been in business for 30 years. In that time a lot of things have changed and competitors come and go but one thing that will never change for us is that we check every dimension and clearance on every engine we build. I don't want someone else doing my machining.
I do not buy World Products blocks or heads because our past experiences with them have been less than satifactory, in addition to that I consider them a competitor to all of the machine shops out here trying to make a living at something we love to do. World Products, GM, Roush and all the others out there with these crate engine programs are cutting our throats and I will not patronize them if I can help it. Just my opinion. Thanks.
I do not buy World Products blocks or heads because our past experiences with them have been less than satifactory, in addition to that I consider them a competitor to all of the machine shops out here trying to make a living at something we love to do. World Products, GM, Roush and all the others out there with these crate engine programs are cutting our throats and I will not patronize them if I can help it. Just my opinion. Thanks.
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I agree with you on the World Blocks and I have been building engines for 29 years now and I have all the fixtures for preparing blocks and I have been over a lot of the blocks I prepared using fixture and other shops that have used fixturing as well and I am glad I bought a the CNC machine and there again if your using fixturing to do machine block this is 30 year old technology and CNC is stae of the art and if this were not true the cup guys would still be using fixtures to do there work with.nwhp wrote:I run a small machine shop in the Pacific Northwest, we have been in business for 30 years. In that time a lot of things have changed and competitors come and go but one thing that will never change for us is that we check every dimension and clearance on every engine we build. I don't want someone else doing my machining.
I do not buy World Products blocks or heads because our past experiences with them have been less than satifactory, in addition to that I consider them a competitor to all of the machine shops out here trying to make a living at something we love to do. World Products, GM, Roush and all the others out there with these crate engine programs are cutting our throats and I will not patronize them if I can help it. Just my opinion. Thanks.
Its hard to argue with CNC machining over bolting fixturing together and setting it in a machine as there are to many errors that can occur.
So far a lot of shops and engine builders put there trust in what we do and so far no returns or complaints and these shops check everything we do as they fit there bearings, rings and check the lifter bores for the proper clearances and no issues so far.
We also build a lot of top engines in the Northeast for the circle track cars and we also have seen an improvement using the CNC method over the Fixturing method.
Again all the shops I have mentioned in this post also can do there own work but feel the blocks we prepare seem to work better, Don't argue with me as I have posted there numbers so give them a call.
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Blocks
Ok, that said again, like I said we dont finish machine parts, you do it to specs that are given to you by a shop, thats great goodie for you!!
now we dont want to compete with any of our customers, and our customers customer. We are not in the "machine shop" business.
For your information I am not a "Salesman" we dont have "salesman", I too am an engine builder so what so I answer questions to people who need assistance, who better than people who have built engines. Maybe some companies employ people whom you think are ignorant, but we do not.
Myself: been in this industry since I was 19 now 35. Ran a local speed shop that was part of a national corporation for 8 years prior to working at Dart. Built engines with several local circle track racers, also lots of local street racers, and have personally my own cars, 331 stroker ford, 355chevy on 74 nova runs in the 10's, 85 Chevy C10-lowered with 355 runs 15's, 2 harleys that I maintain, so my point is I am not ignorant.
My lead guy: 1969 Camaro Z-28 he has owned since High school, and he is 35 also, also a previous retail guy over 11 years, and been with dart for 2 years. Also 79 Malibu with Procharger on a 406 with ported Dart heads. His 69 Camaro has Big Block Chevy with two stages of NOS. Homebuilt all these cars
next guy: professional piston power boat racer and engine builder. Has run these for many of years and built with multiple turbos, normally aspirated.
My point is by no means to gloat but to say you sir are not the brain child of machining parts, building engines, or designing products. You own a machine and you finish parts. This you can do your way for whatever reason you might, but believe this you are not the only guy who thinks there way is right, you are not the only guy who can machine parts. And I would say that guys who have machined parts for 40 years with their "junkie fixtures" know what they are doing, even if you dont think so!
We are not ever going to be World, Roush, or GM if you want to buy their premachined parts thats great, we support the machine shop owner and what they do with our products.
I really would love to here you tell Richard or David Reher or anybody with their crediantials how smart you are, and how the bores being located on the y axis being off .002 makes a difference. You truely are manipulating people who dont have enough knowledge to disagree.
I really have nothing else to say about this subject and refuse to have anymore of a pi$$ing match with you as you can see you are already attacking many of machine shops out there, and you are only going to hurt yourself with your CNC machine!!
Oh by the way we can chest pump too we have 15 Makino Machines that cost over $650,000.00 each not counting tool changers, tooling, and fixtures. 3 BostoMatic 5 axis machines for CNC head porting, 5 Fadal 3 axis machines for bowl blending, making intakes, stud girdles, pistons (yes we machine our own pistons, including ring lands, gas ports, etc.), 7 serdis, two crank balancers, one super flow wet bench, two superflow dry benchs, our own coating division, our own pattern shop, our machine shop has been in business over 40 years, RMC machine for doing lifter bores, lifter bushings, decking, boring etc. WE also have two engine dynos, build about 4 motors per month, sure not alot thats for us though we dont sell engines, except for NHRA Pro Stock, you could not even imagine some of the stuff we make for those engines ourselves, all of our Jesel stands, machine all the block ourselves, even though we do them wrong. So again we are not stupid we know what we are doing and can tell you why we do it.
Can you tell us what it matters when you move the bore?? Tell us we need to know????
now we dont want to compete with any of our customers, and our customers customer. We are not in the "machine shop" business.
For your information I am not a "Salesman" we dont have "salesman", I too am an engine builder so what so I answer questions to people who need assistance, who better than people who have built engines. Maybe some companies employ people whom you think are ignorant, but we do not.
Myself: been in this industry since I was 19 now 35. Ran a local speed shop that was part of a national corporation for 8 years prior to working at Dart. Built engines with several local circle track racers, also lots of local street racers, and have personally my own cars, 331 stroker ford, 355chevy on 74 nova runs in the 10's, 85 Chevy C10-lowered with 355 runs 15's, 2 harleys that I maintain, so my point is I am not ignorant.
My lead guy: 1969 Camaro Z-28 he has owned since High school, and he is 35 also, also a previous retail guy over 11 years, and been with dart for 2 years. Also 79 Malibu with Procharger on a 406 with ported Dart heads. His 69 Camaro has Big Block Chevy with two stages of NOS. Homebuilt all these cars
next guy: professional piston power boat racer and engine builder. Has run these for many of years and built with multiple turbos, normally aspirated.
My point is by no means to gloat but to say you sir are not the brain child of machining parts, building engines, or designing products. You own a machine and you finish parts. This you can do your way for whatever reason you might, but believe this you are not the only guy who thinks there way is right, you are not the only guy who can machine parts. And I would say that guys who have machined parts for 40 years with their "junkie fixtures" know what they are doing, even if you dont think so!
We are not ever going to be World, Roush, or GM if you want to buy their premachined parts thats great, we support the machine shop owner and what they do with our products.
I really would love to here you tell Richard or David Reher or anybody with their crediantials how smart you are, and how the bores being located on the y axis being off .002 makes a difference. You truely are manipulating people who dont have enough knowledge to disagree.
I really have nothing else to say about this subject and refuse to have anymore of a pi$$ing match with you as you can see you are already attacking many of machine shops out there, and you are only going to hurt yourself with your CNC machine!!
Oh by the way we can chest pump too we have 15 Makino Machines that cost over $650,000.00 each not counting tool changers, tooling, and fixtures. 3 BostoMatic 5 axis machines for CNC head porting, 5 Fadal 3 axis machines for bowl blending, making intakes, stud girdles, pistons (yes we machine our own pistons, including ring lands, gas ports, etc.), 7 serdis, two crank balancers, one super flow wet bench, two superflow dry benchs, our own coating division, our own pattern shop, our machine shop has been in business over 40 years, RMC machine for doing lifter bores, lifter bushings, decking, boring etc. WE also have two engine dynos, build about 4 motors per month, sure not alot thats for us though we dont sell engines, except for NHRA Pro Stock, you could not even imagine some of the stuff we make for those engines ourselves, all of our Jesel stands, machine all the block ourselves, even though we do them wrong. So again we are not stupid we know what we are doing and can tell you why we do it.
Can you tell us what it matters when you move the bore?? Tell us we need to know????
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Re: Same question as motorman
Link to JK@D's profile:CNC BLOCKS wrote: ... As I beliveve I am dealing with a salesman from Dart and not a engine builder who owns a shop and equipment and does this everyday for living.
profile.php?mode=viewprofile&u=626
I have been following this thread, but am now getting a little confused.
Quoted from Dart's website (highlights added):
http://www.dartheads.com/advantages.aspx
"CNC Machining capability:
Dart's machine shop is fully owned; no processes are subcontracted. This provides total and immediate quality control. The size and quality of our CNC machining centers allow castings to be machined in fewer setups, reducing tolerance stack-ups. This translates into finished parts which are consistently superior out of the box and do not require expensive blueprinting after purchase."
JK@D wrote:
Any aftermarket block made has to have this type of work done and that is what guys like CNC specialize in. If you buy a block with this work done and nobody knows what parts you are using then you might have a good one and might not.
Take a chance buy one done, buy you have to ask yourself do you feel lucky!!
There is no way a manufacturer of any block can eliminate the machine shop nor would we want to they are the back bone of this industry and their job is to make sure your parts fit!
Maybe I'm misinterpreting the posts.
You guys could have a lively discussion at PRI. If I see smoke around booth 4725 I'll know why.
Carl Hinkson vs. Richard Maskin
Hmmm wonder who swings more credibility in the industry?
I'll tell ya one thing ... Richard does not suffer any fools! If you are an idiot Richard will let you know it without any reguards for your feelings.
Maybe Carl could attend Richards yearly seminar at PRI and voice his complaints.
Hmmm wonder who swings more credibility in the industry?
I'll tell ya one thing ... Richard does not suffer any fools! If you are an idiot Richard will let you know it without any reguards for your feelings.
Maybe Carl could attend Richards yearly seminar at PRI and voice his complaints.
CNC Machining
yes Dart has CNC machining capabilites, But like Carl states his customers have to fill out a sheet, so that he can amchine the block to allow for their tolerances. We are nto going to get into maching blocks for every Tom, Dick and Harry out there. Thats is what machine shops, engine builders, and the home builder like myself do. We can do it but we make over 10,000 blocks per year, and can you imagine the amount of error's that could occur making each and every block to match one persons specs, not to mention the lag time it would take to precisely measure each and every block to each persons specs. Sure we can do it, my guys are very intelligent, but we dont want to take the machine shop and their expertise out of the market. Thats not what we do. If we raised the prices and bought more machines and hirede more people sure we could, its not what we do. Yes we hone the mains, the cam tunnel, and the decks are square, within .002, and they are typically .002 over the deck heights purchased. But when we hone the mains, and lifters due to variances in products not machined by Dart we have no choice but to hone these holes to the middle to tight side of engine building spec. This will allow aguy to remove more material of go with a .001 extra clearance bearings instead of having to add material, it is easier to remove than to add. I hope this helps you out OldsStroker. Thanks
If the "exactly" 90* angle is the most important thing to maintain to you Carl, what is your cure for when a block needs to be line bored? Now the crank is "higher" in the block and the angle is (slightly) greater than 90*. Is this now tragic? C'mon having the bores sonic checked to have the best cylinder wall thickness overrules your overly anal worry about a couple thou? Btw for all the motors you build, why do you constantly show the same 4 pics of "fill in the blank" over and over, ALL over the internet? Some fresh pics would be nice!
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JK@D sounds like your insulting the engine builders and machine shops I deal with as I am sure those shops and engine builders know what there doing as far a specing a block out for final demensions and machine work.
On all our high end engines we check stroke, Rod lenth and compression height of the pistons being used to make sure there is nothing out of spec as I am sure the shops we deal with do the same. And using will machined componets that go in the blocks makes all the differance in the world.
And I realize when roughing out a block do to heat, Tool pressure there maybe a differance from block to block as Dart, Bow-tie, World seem to average out the same as far as not being exactly to blue print, BUT CLOSE.
As I have mentioned before the best blocks I have had in my machine to check out have been the blocks that have come from the Cup Teams.
As far as the step left on the decks surfaces most of the time we see on the average a .002 step and stack up your .002 tolerance now we are up to .004 correct me if I am wrong.
Hey don't get all pissed off as you may spell a little better. LOL
On all our high end engines we check stroke, Rod lenth and compression height of the pistons being used to make sure there is nothing out of spec as I am sure the shops we deal with do the same. And using will machined componets that go in the blocks makes all the differance in the world.
And I realize when roughing out a block do to heat, Tool pressure there maybe a differance from block to block as Dart, Bow-tie, World seem to average out the same as far as not being exactly to blue print, BUT CLOSE.
As I have mentioned before the best blocks I have had in my machine to check out have been the blocks that have come from the Cup Teams.
As far as the step left on the decks surfaces most of the time we see on the average a .002 step and stack up your .002 tolerance now we are up to .004 correct me if I am wrong.
Hey don't get all pissed off as you may spell a little better. LOL
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I am sure the customers that pay good money for a block don't want to hear that the cylinder locations are out at all and I will see about more pics.RZ@D wrote:If the "exactly" 90* angle is the most important thing to maintain to you Carl, what is your cure for when a block needs to be line bored? Now the crank is "higher" in the block and the angle is (slightly) greater than 90*. Is this now tragic? C'mon having the bores sonic checked to have the best cylinder wall thickness overrules your overly anal worry about a couple thou? Btw for all the motors you build, why do you constantly show the same 4 pics of "fill in the blank" over and over, ALL over the internet? Some fresh pics would be nice!
And when we line bore we only bore the caps and try not to get into block and thats why we do the main lines first not last.
You should know better then that but again I think I am dealing with a salesman not some one that does machine shop work for a living.
I think that if you worked for World Products we would be having the same arguement.
Have called any of the shops I deal with to tell them they don't know how to check parts and how to fill out a spec sheet as we only do what they ask.
And again what is your tolerance on cylinder locations, Cam tunnels ETC. as you have mentioned you may move the cylinders a couple of thousands now saying that now with the plus or minus of that it adds up to quite a bit and thanks for clearing that up.
Last edited by CNC BLOCKS on Tue Nov 15, 2005 7:00 pm, edited 1 time in total.
Website is up and running
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Machine shop tour
http://hinksonautomotive-cncblocks.com/shop-tour/
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http://hinksonautomotive-cncblocks.com/specials/
55MM babbit cam bearings with 1 hole
http://hinksonautomotive-cncblocks.com/
Machine shop tour
http://hinksonautomotive-cncblocks.com/shop-tour/
Monthly Specials
http://hinksonautomotive-cncblocks.com/specials/
55MM babbit cam bearings with 1 hole