Originally Posted by Camaro R/S LT
Have a 350, want a 383. Do I need to bore it .03 over or is that a 400?
From my experience a 383 is a 350 with a different crank(essentially) without any boring of the cylinders. Just need some confirmation.
No you do not need to bore the engine to install the kit. It will be a 377. But for the most part you will want to bore the engine to make sure the pistons and rings seal up. Usally most older engines need to be bored unless they are low miles or recently rebuilt.
.030 .040 and .060 are all good options. But usally bore is decided by the least bore you can do and still make the cylinders perfectly round and free of any taper.