headers vs manifolds on a 318 2bbl difference ????

ir3333 said

And there are straight stretches coming and going from all of our cruz nites were you could run WOT if there is no traffic but even if you stay in it to 90 mph it would only be 3700 rpm. There is no place anybody could run to 5500 rpm on the street safely.

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Try 1st and 2nd at speeds above 40 mph :) 5500 rpm is about 55 mph in 1st and 95 mph in 2nd but I know what you mean even at full throttle on the street your gonna generally spend more time 2500-4500 rpm than 4500-6500 rpm. But one thing being left out is engines that have stronger well built 4500-6500+ rpm power also tend/can to be stronger under 4500 rpms too in all but the lowest rpm. Key word is well built.

Eg a factory 340 makes around 275-300 ish hp at 5000 rpm a well built 340 might make 400 hp at 5600 rpm but will make 275-300 hp around 4000 ish rpm sooner and more usable why a 400 hp engine feels so much stronger. A well build 500 hp 340 might make 400 hp by 5000 rpm and 275-300 hp even sooner. Your not gonna hit those mid rpm power numbers with an RV cam.

Not saying build a 400-500+hp engine for better mid rpm power, but a well put together engine that makes peak power in the 5200-5600 range even if little plans to operate there can give better mid rpm power with little effect down low if done right.