441LSXTT

He said he made 625rwhp on 93 pump on that thread

nuke61

Sweet, I didn't notice that. I think it sounds great, but I couldn't live with a cam that big. Too much time spent in stop/go traffic.

murf257

I am TOTALLY in favor of American Heritage and Kohle!!

Frans96ss

AI hands down

REDZED2

Only seen 3 pair of AI heads including my own. WCCH does fine work as well but AI is just a cut above. As they say you get what you pay for. Customer service is A+++++. Mu buddy added 280 AI's .015 mill with TQ 110, LG 1 7/8" LT's and KB 103 and dyno'd with stock intake manifold on 94 pump. Corrected 577/542. So he's a bit faster than me from 3rd up.

Not including custom TM heads in the equation. This is just between the 2 companies mentioned. I have seen AI 280's in the high 9's NA. If that means anything. Lots of compression though.

American Heritage

Thank you sir!

We have alot of corvette forum members running our Package 4 heads.

http://www.americanheritageperformance.com/
310-326-2399

UH-60DRIVER

Same here! Kohle's knowledge and customer service is second to none. Can't wait to get mine.

TXGS507

Another member here sporting Kohle's AHP4 heads....

jayyyw

I'd go WCCH

441LSXTT

If you compare the flow chart between the two AI flows almost the same as WCCW on intake side but AI out flows WCCW by 30-40cfm on the exhaust side.

95vettski

Can you post up the AI flow numbers and on what bore size was used?

441LSXTT

Here you go




Here you go.

441LSXTT

So what do y'all think?

JoesC5

I went with the PRC265 heads(which flow better than the stock GM heads), and you can go with their PRC285 heads if you want even more flow. They are not GM castings. I wanted everything new, including the castings.

JoesC5

I wonder why WCCH used a test bore of 4.155" when the stock bore LS7 is 4.125", and is what AI used? That difference in bore diameter will have an effect on flow rates.

PRC265...

.600 lift-----383/235
.650 lift-----388/241

PRC285...

.600 lift----386/235
.650 lift----393/241

PRC's stock LS7 head measurement is different from WCCH's measurement....

.600 lift 351/209
.650 lift 353/204

BigVette427

Agreed - you have to compare apples to apples to get an accurate picture. Also equally important is the baseline numbers - while OE CFM rates may vary slightly on different benches, the levels of increase tell an equally compelling story.

Frans96ss

Dont get hung up on flow numbers guys..... I used to use WCCH all the time and our packages would only make 580-590.... switched to AI and the same package will make 600-610 all day long now.

441LSXTT

AI it is. I found some LS7 heads last night from a guy on this board he happens to be a local as well. I just couldn't have any downtime since the car is my daily driver. And I was only considering WCCW because a friend of mine works for a shop and has these heads on the shelf

Michael_D

Tomy Mamo has a killer CNC program for OEM castings too. You don't have to buy the Trick Flow heads.

I would give AI the nod over WCCH.

441LSXTT

I did not know that. I talk to him he was only talking about his trick flow heads and it was a little too pricey for me because I have to buy new rockers and just a heads CNC is expensive in itself. I might have to reach out to him and ask him about it.