Reply to "4-V Heads vs. 2-V Heads"

Keep in mind that the "small" 2V valves & ports are, as-stock, larger than the largest ported 350 Chev valves & ports ever built. 4V valves & ports are big-block sized. Quench heads (either 2V or 4V) will jack the compression ratio up to 2 points over your stock open-chamber heads (8:1 up to 10:1) which increases the power but requires premium fuel and much care in setting ignition timing, valve clearances etc. 2V quench heads will increase low end power and throttle response noticably over 4V quench heads since the ports are smaller so fuel/air velocities are higher. Either will pull strongly at 6500 if the cam, springs, carb & compression etc are coreectly chosen & assembled. Dyno tests show that for street engines, the Edelbrock 'Performer' dual plane intake can equal or exceeed power from most open-plenum intakes and may be better mid-range as well.