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I guarantee most of the extra power came from the hc piston and the tune but if you have to do a top end anyway then the price of and Athena cylinder might be cheap enough to justify a 16cc bump.My buddy did this when he did his topend on his 350. Did a hc piston as well with some mild port work and tuned on a dyno. His 350 rips. Felt like my 450, but with 2000 more revs. I'm sure the 16cc helped, but the cr bump port work and tune probably did the most.... but 16cc's is still 16cc's. Haha