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(A)Your exhaust port opening needs to be in square inches. (B)The inside diameter (measured in square inches) of the primary needs to be no smaller than the port. (C)The collector inside diameter (measured in square inches) needs to be no smaller than 4 X the primary. C = Bx4 "or greater" B =...

Example; if you exhaust port was perfectly square and measured 2" x 2" that means the primary inside diameter must be 4 square inches or greater, and the collector I.D. must be 16 square inches or greater, no matter what the length. The formula's for measuring oval's and round tubing can be a...

Tube length only comes into play for scavageing. S/C motors do not care about that, they only want no step down or restriction. That is why you see zoomies on blown cars.

No, lenght of tubes does not matter, only the square inches of a cross section at any one point.

Header size for max perf on a S/C motor does not matter, as long as there is no restriction. You will need to know your exhaust port square inch measurement and your tubes (inside diameter square inches) should be no smaller than the port measurement. Also 3 1/2" collectors should be OK. The...

Did you go to a smaller or larger pulley. Top pulley, less coogs=more boost, more coogs= less boost.