Anybody install AFRs on a big block?
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Joined: Dec 2000
Posts: 640
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From: El Paso Texas
Car: 86 z28
Engine: Hyd. roller 498
Transmission: 700r4
Axle/Gears: 12 bolt 3.90 gears
Anybody install AFRs on a big block?
I am looking into AFR heads and they have a .375 raised port , trying to see if they would work with hooker swap headers. Thanks. My engine is about to be assembled here are some pics of the parts at machine shop. Will try the "reworked" 781's (2.19/1.88) valves for a while then IN go the aluminum heads.
Last edited by Big454blockchevy; Jul 10, 2008 at 02:54 PM.
Thread Starter
Senior Member
Joined: Dec 2000
Posts: 640
Likes: 0
From: El Paso Texas
Car: 86 z28
Engine: Hyd. roller 498
Transmission: 700r4
Axle/Gears: 12 bolt 3.90 gears
Re: Anybody install AFRs on a big block?
OK, read my post again and didn't specify for what vehicle(ofcoarse a thirdgen camaro). I'm thinking AFR heads would need custom headers.
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Anybody install AFRs on a big block?
Hooker swap headers will work with raised port heads but some modifications are required under the car to move the headers up. The headers are designed for standard heads like the 781's. As soon as you use a raised port head, things get difficult. I had Merlin oval ports on a smaller engine, 469, with the hookers and it was tight because of the raised ports.
Thread Starter
Senior Member
Joined: Dec 2000
Posts: 640
Likes: 0
From: El Paso Texas
Car: 86 z28
Engine: Hyd. roller 498
Transmission: 700r4
Axle/Gears: 12 bolt 3.90 gears
Re: Anybody install AFRs on a big block?
Thanks for the info Stephen 87 , hadn't had a chance to come in here. Just watched that 9 sec run 
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