Q: What is the horsepower on a 5.7 350 bored 30 over Chevy engine?

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That would be called a Chevy 307 bored .40 over.

A 262 bored 30 over.

A 427 bored .60 over is 438.8572417 or basically a 439.

332

355

All else being equal, about 10 more than it had before.

it depands on the camshaft and heads. with 30 over windsor it should make at least 370 horsepower with aftermaket camshaft

First off, the 402, is just a 396, bored .030 over. The HP rating will be aroun d 300, to 325. It is a torque motor, more than a horsepower motor.

355 is a non stroked just bored 4.030 over 383 on the other hand put a 3.75 stroker crank and bored honed so i would pick 383 . 355 is bored not stroked clearence for stroker crankbest engine would say is 383

A 350 starts out with a 4.000" bore and a 3.48" crankshaft stroke which really only gives you 349.8 cubic inches. (Chevy rounded it up to 350) Your engine which has the same stroke of 3.48 but now is bored .030" over (making the cylinder bored size now 4.030) total size of 355.1 cubic inches or just a 355.

355

a Chevy 350 bored .060 over would be 360.4 cubic inches