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The gen VI returned the mechanical fuel pump boss and added roller lifters, other than that it should be the same as a Gen V. As for the internals, the gen V and VI HO engines had forged pistons, rods, and cranks. Is your's stock? With the 9.5 (HO's are 8.75) compression ratio that would mean a ZZ502 (which would add shot peening to the rods)
