Re: Boring out the 237 Packard 6

Posted by Rusty O\'Toole On 2016/12/16 2:15:35

On engines made before the early sixties it was typical to bore up to 1/8". They were designed with thick cylinders. It was assumed the engine might be rebuilt once or twice in its working life. Some Oldsmobile V8 blocks could be bored 1/4" that is .250 oversize.

That was on a fairly new block that did not have corrosion problems or core shift. You could be a bit chancy because there were enough engines around that if you ruined a block you could easily get another one.

Today I would suggest keeping any overbore to the minimum necessary to true up the cylinders especially on an engine from the thirties.