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

mgoblue9798 said
Problem with the dyno tests are they all seem to start at 3000rpm at wide open throttle. They don't show anything about driveability, part throttle, or low rpms.

Most dyno tests have cams that start at that area of rpm. Any reasonable hot rod even if equipped with a smaller cam like a 220/224@050 should, for best performance, have a converter that flashes around that area even though the cams power band (listed) is lower.

Remember a dyno is testing the engine at WOT, not part throttle.

ir3333 said
below 3000 is where everybody drives 99 % of time. 1200 rpm to 5200 rpm is plenty on the street
and usually provides better lo rpm torque instead of high rpm hp.

Mostly because the cams tested at 3K plus aren’t designed to operate under full throttle conditions under 3K.
(That and the above.)