Two other things that are important are having a 0-deck block and keeping the cranking compression at about 175 lbs by using a cam with more overlap. It works and gives more power.Also helps to keep motor cool. Able to run on 92 octane.
Jim G. 67 conv 400
I'm skeptical on the zero block clearance issue. I have one 400 that is zero decked and one that's 'in the hole'. The 'in the hole' engine actually runs cooler. I can attribute some of it to the manual trans. If I run it without a thermostat, it will not go above 150 degrees.
