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305 and 350 are the same block. The bore is slightly different, is all. You can bore the 305 out to accept the 350 pistons and it works perfectly.
1st number is bore, 2nd is stroke
305 = 3.740" x 3.48"
350 = 4.000" x 3.48"
I'd take the 305, personally, because it'll rev quicker. The only difference between the 305 and the 350, is the 305 is low on torque, for the obvious reason. The 305 was only a bit short on the Hp from a 350. This comparing the 2 motors via the 89 IROC-Z, which I have experience with. The 350 only had 15 more Hp than the 305, but torque was alot higher. Easily cured with a supercharger, and the 305 has better throttle response. If you're looking at an LT1 or an LS1, then all bets are off, but if your swapping in one of the older TPI units, my bet is on the 305.
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1992 Yamaha FZR 1000. 145 Hp, all stock..
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