Hello, I'm new to these boards. I was sent here from Corvette forums in need of some help of a new crate motor I put into my 86. It's a summit 350-350hp motor, which they stopped building over 5 years ago, so I can't find the info I need. It's regarding the heads - they tell me they're modified aluminum GM 305 heads with bigger valves and slight porting. Can anyone give me the flow #s, runner volumes, original valve size, or maximum lift? Anything would help. Thanks.

 

I looked at the heads and there is a number cast into them. 14591. I've googled for weeks with no luck. Anyone know anything about these mystery heads?