I was AFR's site an was reading about these heads. Any of you have a set? Any opinions? I am kinda on a budget but I know I need good heads for my sleeper. I am building a 355; w/TPI an thought these would be the perfert add on. Thanks DL

 

I bought a pair this fall. Just got them back from being assembled and had some prting done. Won't know till spring how good they are, but the shop I had do them were impressed. Matter of fact the owner ended up buying a pair for himself. Summit sells them also they are actually made by Pro Action.

 

I would definitely like to know your opinion after you've burned them in. DL

 

I've seen the heads in Summit and they have rediculously high flow numbers fro SBC heads. But they also have rediculously big intake ports to get the big flow #'s, which will destroy all bottom end in a 350. You will have to run a BIG cam to be able to take advantage of the high RPM flow properties. which makes it idle like poop. You will also need a BIG set of gears (4.56 range) and a very high rpm torque converter (4000+ rpm). Not much of a sleeper then.

Since we are on the ssubject of sleepers, here is what I think a true sleeper is:

1) A car that looks dead stock or real close (the exact look from the factory) inside, out, and under the hood.

2) A car that sounds stock (idle and driving).

3) Is rediculously fast for what it looks and sounds like.

When I think third gen sleeper, I'm thinking of a 383 Cross Fire that runs 12.0, but looks like a 16.0 car.

Or a 420 with an LG4 look to it that runs in the 11's.

Or a 396 with a stock looking TPI that runs 12.0.

These are the type of cars that would catch others by surprise, not the Holley carbed, big intake, galsspack wearing, chrome vavle covered, rusted cheap headers, flex fan wearing cars that call themselves sleepers.

 

I have a sleeper. I had a stock l98 with a paxton sn2000m = 8lbs of boost, flowmaste cat back, tes headers, slp runners and ported intake with 24lb injectors. My best last year was a 12.8. I just put the new engine in with AFR 190's, ZZ3 cam and it is as fast without the supercharger now as it was with the supercharger & stock engine. Can't wait to put the supercharger back on And the paxton is very quiet!

 

zzzzzz....... zzzzzzz....... zzzzzzz.......

 

These are the heads I have picked out for the 377 I am building. It is a 470Hp 500ft-lb monster, with a powerband that starts at 1500 and falls off at 5600. That is using a relatively small cam, also. I am going with the 2.02/1.60 200cc intake and 64cc combustion chamber heads. I'll be sure to put up a post when I get it going and let you guys know how it runs.

 

Check out their site www.procylinderheads.com and look at the flow numbers.You have to have some crazy lift .700 to get the flow numbers they show.