Inliners International Forums General Discussion Blown and Injected Chevy 250 4.1 Integral Head Combustion Chambers

CNC-Dude - I've seen some test results using 1.94/1.60 valves on a 230/250/292 head, and yes there are definitely CFM benefits in doing that. But I think that there could be more CFM potential with this chamber and 1.94/1.60 valves. Unfortunately the GM PDF I linked to in the first post shows that the integral head has less material at the valve throat area than the non-integral head (something like 1.3" vs 1.5" diameter). So I'm uncertain whether the integral head could even be machined for larger valves. I'll have to find a cracked one and cut it apart to find out (unless someone on this forum has already done that).