Inliners International Forums General Discussion Hi Performance Building a 302 GMC for LSR

Yeah, the siamese exhaust is fair, but the single port is pretty bad! There are several companies that have the common SBC valves with a blank stem so you can cut your grooves if you choose to. Im also going to test a 5/16" stem and 7mm just to see what the airflow advantage is for these heads. Its pretty substancial on SBC race stuff, and with these heads, any extra you can get, is that much more than you had. Overkill maybe, but thats the point of this exercise, to take these heads where no man has gone before....