Looking for a few tips on porting 351c 4v heads

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Kazoom
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Re: Looking for a few tips on porting 351c 4v heads

Post by Kazoom » Sun Oct 18, 2015 4:52 am

for those interested, some more info/pics on the Aussie COPY of the old American high port Clev head...

post#133...
("The PC head exhaust port is very close to Yates height")
http://www.yellowbullet.com/forum/showt ... 008&page=9
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Re: Looking for a few tips on porting 351c 4v heads

Post by Kazoom » Sun Dec 20, 2015 6:38 pm

xRACER/sscuda/AL, you got some serious metal health issues following me around crying like a little 12 yr old girl, go get some mental health help.

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Re: Looking for a few tips on porting 351c 4v heads

Post by Booyah45828 » Sun Dec 20, 2015 9:00 pm

Why does the port shape here http://www.ebay.com/itm/Ford-302-351C-C ... 1935937328 look drastically different then what you have pictured? I understand it's the "speedmaster" brand but AFAIK speedmaster and procomp are one in the same.
Here's a question for you, what ever happened to the procomp electronics website?

More importantly, why is it that most professional builders won't reccomend using those brands versus other options, and a large number would reject using them altogether? Why does it seem that there are more horror stories regarding the use of those brands then praise/achievements? Also, why is it that you find everybody who contradicts you as a troll?

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Re: Looking for a few tips on porting 351c 4v heads

Post by Kazoom » Mon Dec 21, 2015 12:49 am

are you too lazy to click on the link... http://www.yellowbullet.com/forum/showt ... 008&page=9 to read that he changed the bolt pattern to a yates pattern???

More importantly why are you crying to me?, can you not click on the links and read it yourself?,

are you living under a bridge?, lots of builders are offering these A-3 type port heads...
http://forums.corral.net/forums/11333975-post99.html

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Re: Looking for a few tips on porting 351c 4v heads

Post by mag2555 » Mon Dec 21, 2015 6:58 am

Good thing they are high port Exh,as those round floor ports are a full on nightmare other wise on a running motor no less on a flow bench!

The expansion rate from the throat on out is just too much and too fast.

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Re: Looking for a few tips on porting 351c 4v heads

Post by russxr67 » Mon Dec 21, 2015 8:49 am

[quote="Kazoom"]the problem has become that some aussies have taken this int port stuffing crap into the realm of the fricken retarded...

another aussie version...

Image



I took this pic a few years ago to reveal the difference between a 3v 185 CHI port location vs 2v location. That tiny little turd port cranked out 564hp on a 383 Cleveland.

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Re: Looking for a few tips on porting 351c 4v heads

Post by Kazoom » Sun Jan 17, 2016 11:53 am

... compared to 690hp on PUMP GAS on a 400ci street/road r eng using a pc/avg xtc A3 type port budget Clev head casting a few years ago...

https://www.youtube.com/watch?v=FAVNzHLJ4GE
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Re: Looking for a few tips on porting 351c 4v heads

Post by turbo2256b » Sun Jan 17, 2016 12:22 pm

Flow # for some ford oem closed chamber heads I ported for a pantera
intake
.100 ... 70
.200...131
.300...198
.400...248
.500...300
.600...322
.700...330

EXH
.100 ... 64
.200...107
.300...145
.400...169
.500...192
.600...200
.700...200

.600 lift cam with 1.7 chevy rockers (not 1.73) ported Torker reduced air flow to 270 at .600 lift. 850 Speed Demon (carb too small) 10.1 comp, best I COULD DO AT THE TIME TO FIT UNDER ENGINE HATCH. 500 ft lbs @ 4200 rpm 500 hp @ 6000 rpm at the flywheel.

Similar version I DID BACK IN THE EARLY 70S HAD OVER 650 AT REAR WHEELS bigger carb better intake 13.5 compression

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Re: Looking for a few tips on porting 351c 4v heads

Post by mag2555 » Mon Jan 18, 2016 7:00 am

These power numbers sound right for that level of compression and int and Exh flow!

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Re: Looking for a few tips on porting 351c 4v heads

Post by Kazoom » Sun Feb 19, 2017 3:14 pm

piston guy wrote:
Kazoom wrote:in 69-70 Ford Indy designed removable/changeable intake port inserts for the 4V head for Trans-Am racing for more velocity with the Small 302ci eng...

http://www.ponysite.de/transam_stevens3.htm

Image
Image

Port inserts were not SCCA legal. The heads pictured are T/A heads and as I mentioned far different than production heads. There was also a "small port" head created for 1970/71 use that featured "filled" intake ports. I have Bud Moore engine build sheets that note their use and the comments are not great. Power was down on them and few were used. Some raw castings are "floating around" and may never finish machined.
looking for some info on the cast iron 4V Boss/TransAm heads,
with the port floor being changed/raised about 1/4" on them over the production 4V Boss head would you know if the short turn was raised/changed also ???

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Re: Looking for a few tips on porting 351c 4v heads

Post by mag2555 » Mon Feb 20, 2017 6:35 am

I belive it was, I think I have other casting mold pictures that differed from what you posted that show such.
I need to dig them out, I mean really dig them out!!

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Re: Looking for a few tips on porting 351c 4v heads

Post by Casper393W » Tue Feb 21, 2017 4:13 pm

I have a set of D1AE heads closed chamber 4bbl heads if anyone is looking for a set!

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Re: Looking for a few tips on porting 351c 4v heads

Post by Steve.k » Tue Feb 21, 2017 7:07 pm

[attachment=0]IMG_1228.PNG[/attachment][attachment=0]IMG_1227.PNGHere is flow chart for 4v cc heads. Mostly seat change very little work with grinder. With mpg port plates exh comes up to 220cfm.
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Re: Looking for a few tips on porting 351c 4v heads

Post by 1mach » Fri Oct 06, 2017 3:42 am

Out of the box Flow numbers are intake 392CFM and exhaust 275CFM as cast

Hammer Head Hemi Cylinder Heads BHH-1 Bolts on to any 289/302/351w and 351c engine blocks

www.hammerheadperformanceengines.com
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Re: Looking for a few tips on porting 351c 4v heads

Post by Steve.k » Fri Oct 06, 2017 10:08 am

The Cleveland head and the exh have been the topic of many forums. It is interesting to hear the many different views on what seems to be a lazy flowing exh number. Ive heard everything from changing to hi-port to leave it mostly alone. There has to be a engineer or two still alive that worked on those heads that can shed some light on what their theory was on that head. Even on untouched form they have made impressive numbers that leave engine guys wondering why they work. 500hp is basically a walk in park for a stock head. What is the highest hp you have seen on un modified head?

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