Camming a 409 sbc with small intake runner

[BowtieNut]

If the 062 are opened to about a 200 cc with a 2.1" pinch and a 2.08" valve 304 is possible .

- not without visiting the water jacket

As I've mentioned before it has over 70 passes on it and at least 30 dyno pulls with no water anywhere it don't belong. They are eggshells but they've held up this far. I know its crazy to even spend that much time in a set of vortecs but I get a kick out of doing things that I've been told can't be done.

[Carnut1]

I am so with you on that! Nice work! I think there is at least 40 HP more left in that combo with cam, rockers, spacers and timing.

[automotive breath]

Looks good, nice burn pattern may be a shade rich.

Got any more pictures?

[GARY C]

I could see those heads flowing those #'s but not at those lifts, I would check the tool used to set lift on the bench, at .100 lift your valve and seat is going to limit what it flows and a 2.08 valve at .100 with a very good valve job is going to be in the 78 cfm range give or take 2 cfm.

I would be looking at a cam in the 248 to 252 range at .050 on a 106 to 108 LSA installed on a 102 ICL. and a rocker that will get you close to .600

[GARY C]

304 cfm @ 0.500 lift on a 062 vortec head,like joe mondelo said (rip) you are crazy or you are smoking dope-end of story.

Haha well you believe what you want. The fact that it makes nearly 490 HP with a dual plain manifold and a cam with overlap degrees only in the high 40s should be an indication that they are moving some air in the low lifts. The cam that's in it will literally idle smooth as butter if I loosen the lash up to anything wider than .024. I figured someone would raise the BS flag on me haha.

Keep in mind there are a lot of 383's with 10.1 and AFR 195 heads making 530 to 580 with Air Gap intakes and 248 at .050 range HYD rollers.

[BowtieNut]

304 cfm @ 0.500 lift on a 062 vortec head,like joe mondelo said (rip) you are crazy or you are smoking dope-end of story.

Haha well you believe what you want. The fact that it makes nearly 490 HP with a dual plain manifold and a cam with overlap degrees only in the high 40s should be an indication that they are moving some air in the low lifts. The cam that's in it will literally idle smooth as butter if I loosen the lash up to anything wider than .024. I figured someone would raise the BS flag on me haha.

Keep in mind there are a lot of 383's with 10.1 and AFR 195 heads making 530 to 580 with Air Gap intakes and 248 at .050 range HYD rollers.

Your right. Not comparing my vortecs to Afr 195s. Afr's are far superior hands down. Just because the vortecs flow freakish flow numbers don't mean they will make huge power. These vortecs would probably make better HP numbers on a bit smaller displacement.

[GARY C]

Yes but you are claiming flow #'s that AFR can't reach...your saying you have 40 cfm more at .200 than an AFR head or anyone's heads for that mater when your numbers are that far off from ever pro head porter you have to question your equipment, If those flow numbers were correct you would have the HP to back it regardless of the castings.

[bigjoe1]

Those vertec flow numbers are BULL SHIT


JOE SHERMAN RACING

[BowtieNut]

Well guess you all will have to go on thinking it can't be done. Maybe it is the equipment but the bench gets calibrated regularly as well as the dyno. I'm working on a set of lsx-ls7 heads now that flow 394 at. 700 which is about what everyone else claims. So no astronomical number there. We have been told that our dyno reads pretty conservative compared to others. Goes to show that the flow benches and the dynoes are merely a measuring stick. Lots of folks love the get tangled up in the wrong numbers. It ran a 6.38 in a 3100 lb car, so its not a pooch by any means. Not going to get in a pissing contest with folks over what a flow bench reads. If you don't believe it then you just dont. It doesn't make me lose a bit of sleep at night.

[af2]

The thing that bothers me is how you have 30+ cfm at .500" over what Meaux has at .700" ......

[af2]

http://users.erols.com/srweiss/tablehdc.htm#Chevy


Stan thank you for the valuable info!!!!

[BrazilianZ28Camaro]

304 CFM through 2.1 choke is 144.76 cfm/sqi, the maximum value attainable is 146......most experienced head porters stuck and start to lose hair at 136 cfm/sqI.

[BowtieNut]

Well then I guess when its time to freshen it up I will try them on another bench. Until then I should see a bit more potential with the cam I'm about to stick in it. If I decide to go solid roller then I will probably just go ahead and pull the heads now.

[GARY C]

I don't doubt the total flow if the head is the size you quoted it's the lifts you show them at that don't fit, I have an RHS head that poured at 195 cc and ported to a 198 cc it has less than 2 sq at pinch around 1.98 sq with a 2.08 valve it flows (on the conservative side) on a 4" bore and checked on 3 benches.
.100- 71
.200- 141
.250- 172
.300- 199
.400- 242
.500- 277
.600- 297
.700- 302

I am not a professional porter and not saying you couldn't do better than this but this is in line with what is seen across the board on this size head and valve combo.

http://www.airflowresearch.com/index.php?cPath=24_29
http://www.speierracingheads.com/RHS220Econo_flow.pdf
http://www.speierracingheads.com/PF210c ... 20data.pdf

[BowtieNut]

I don't doubt the total flow if the head is the size you quoted it's the lifts you show them at that don't fit, I have an RHS head that poured at 195 cc and ported to a 198 cc it has less than 2 sq at pinch around 1.98 sq with a 2.08 valve it flows (on the conservative side) on a 4" bore and checked on 3 benches.
.100- 71
.200- 141
.250- 172
.300- 199
.400- 242
.500- 277
.600- 297
.700- 302

I am not a professional porter and not saying you couldn't do better than this but this is in line with what is seen across the board on this size head and valve combo.

http://www.airflowresearch.com/index.php?cPath=24_29
http://www.speierracingheads.com/RHS220Econo_flow.pdf
http://www.speierracingheads.com/PF210c ... 20data.pdf

I never seem to have as much luck trying to get the after market heads to flow big numbers at low lifts. I have a set of factory aluminum LT1 heads that came of my 97 trans am that I've been messing with for some time now. I haven't poured them to see what volume yet but they are somewhere between 200 to 205 range with an educated guess. Again they flow some numbers in the low lifts that will make most of you folks call me a lying sob, but I don't just pull these numbers out my rear. Maybe I will flow that head on another bench.
With a 2" valve it flowed
.100--97cfm
.200--172
.300--223
.400--265
.500--294
.600--302
.700--302

I will actually sit for long periods of time sanding with my fingers and Emory strips in placers of the port that I can't shape as well with the die grinder. You can call me an effin liar if it makes you feel better but I'm being as factual as I can be.