01-10-2018, 12:01 PM
As far as matching ports goes, I feel that if the manifold inlet ports are not blanked at all by the block there is little to be gained by removing metal, and like wise in the exhaust ports try to be sure that the manifold does not blank the block exhaust ports. You will get smoother gas flow by having the ports exactly matched and polished, but it is a diminishing returns situation in relation to effort.