88blkiroc

When I get out of school next year I plan on making my IROC a summer only monster. I would like to use Dart's 227cc CNC ported aluminum Pro 1 heads. these are the stats:
318cfm intake
230cfm exhaust
227cc intake ports
85cc exhaust ports
66cc combustion chamber
angled plugs
2.08"intake/1.60"exhaust valves

I know these are some insane heads but the car is gona be ***** out all the way around.

My main question is will the Stealth ram even come close to flowing enough to match these heads?? If not im gona get another carb intake converted to EFI.

secondary question: If the stealth will flow enough air for these heads, any recommendations for a cam? Motor will be around 10.5:1 compression. Also running a 150 shot of juice. I know this sounds like a dumb question but cams are one area i have never really learned about. Thanks for the help.

rockind78

300 cfm. Don't remember where I got that figure though.

88blkiroc

318 is from summit

309cfm@.700"/28" from Darts website

Jim85IROC

iTrader: (2)

I don't think the HSR has actual flow numbers published yet, but I believe that Doug Flynn mentioned something to the tune of 300cfm per runner in unported condition. Port matching them to the heads should all them to provide adequate flow.

as for a cam... well, you'll need a huge one to allow those valves to open enough to flow enough air to feed those heads. I'd guess that you're probably going to need a solid roller cam with an insane amount of lift. Don't plan on making this car a daily driver.

89ProchargedROC

sorry to burst your bubble, but i think the flow wont be the problem....the intake port is.

i dont think there will be enough meat on the stealthram intake port to get the big gasket to fit it.

i've having trouble just getting a 1206 gasket to fit and i think a 227 is around a 1207

go with a carb converted intake

BadSS

89ProchargedROC is right.

The Holley intake can not be ported to a 1206 intake in the "standard location" without adding material to it by welding. So,, you won't be able to bolt on the manifold "out of the box" if buying aftermarket heads already ported to a 1206 (or larger). You can see that in the pictures Bort62 posted for me in this link. The 1/16 - 1/8 of an inch that would be left is just not enough material. I guess you could elongate the holes on the gasket allowing it to drop down on the intake and heads and “custom” port and match them to a slightly “lowered runner intake”. Why Holley made a frickin tunnel ram intake that won’t at least open to a 1206 without welding is beyond my comprehension.

https://www.thirdgen.org/techbb2/sho...&highlight=HSR

Jim85IROC

iTrader: (2)

Does anybody really expect to make stupid-high levels of horsepower by using "out of the box" equipment? When's the last time somebody bolted crap together and ran 10s? If he wants that kind of horsepower, he's looking at some pretty intense work and some pretty extreme costs no matter what induction route he takes. Adding some material to the manifold probably isn't the biggest challenge he'll face if he's actually planning to go through with such an extensive buildup.

I suspect that his transmission & rear end costs will be so high, a couple hundred bucks to have extra material welded to a manifold so he can port it won't even get noticed.

89ProchargedROC

stock tpis miniram
stock out of box AFR 210 heads
T-trim
15psi
large hydraulic roller

10.0 @ 140

who said out of box stuff doesn't work well?