Need some info on heads
Thread Starter
Pro
Joined: Jan 2008
Posts: 584
Likes: 1
From: Near Lockport NY Black 1986 Coupe
Need some info on heads
The motor I have, after talking to summit directly about it, is running a semi-ported version of the GM 305 heads with bigger valves. Does anyone have any info or flow charting of these heads? I've searched high and low and can't find anything. Seems like Summit stopped building these motors about 5 years ago so their website is a dead-end. Any info is appreciated guys. 
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Ask over on 3rd Gen site ; plenty of 305's there; none in Vettes
http://www.thirdgen.org/techboard/tech-general-engine/
http://www.thirdgen.org/techboard/tech-general-engine/
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
The motor I have, after talking to summit directly about it, is running a semi-ported version of the GM 305 heads with bigger valves. Does anyone have any info or flow charting of these heads? I've searched high and low and can't find anything. Seems like Summit stopped building these motors about 5 years ago so their website is a dead-end. Any info is appreciated guys.
-- Joe
Thread Starter
Pro
Joined: Jan 2008
Posts: 584
Likes: 1
From: Near Lockport NY Black 1986 Coupe
It's a 350. They're aluminum heads, searching on sites I can only find the CI version, so it's getting disheartening. I can't get a casting # as the car is at the shop right now. Just wanted to know if anyone had flow numbers - from what I'm told they flow about the same as the 113 heads but I'd like to know if they're worth porting or just getting a new pair in the future.
