I am aksing this question on behalf of my freind. He owns a 70 Camaro with a 350 block. He isnt sure what its got in it for internals as he just bought the car and the guy he bought it from just told him it was a 350.
He asked me if there is any way to figure out if it is a 307, 327, internally etc etc. I tried to explain to him that it isnt all that hard but he asked me to post the question anyhow.

Anyone got any suggestions for him?

There should be a suffix code stamped on the pad behind the alternator. That will tell you what it is.

Bore x Bore x stroke x .7854 x 8 will give you the CID.

Good answers but not quite what he/I had in mind. We know its a 350 block. What he doesnt know is whats inside it. How do figure out the bore or stroke if you dont know physically whats inside the engine?????????????????????????

Get a long, thin, STURDY plastic probe, stuff it in the cylinder via the spark plug hole.

Turn the crank with a breaker bar and socket--carefully--and measure the lowest point of the piston vs. the highest point. That's an indication of the stroke. Match the indicated stroke to the common cranks used in small blocks to make an educated guess at the actual displacement.

Small block strokes: 3" (302), 3.1" (312, NOT A LIKELY COMBINATION), 3.25" (327), 3.48" (350), 3.75" (generally called a 383)

Unless the overbore size is stamped into the piston where you can see it, there's no way to make any kind of accurate measurement. Assume + .030 if you suspect it's not a standard bore.

The stamp will tell you what the original block should have been, no way to know whats actually in it ie...bored 350 to 355 or 350 stroked to 383 unless you tear it apart and measure everything. Good luck!

A motor like this, I would just assume it's a 350 if thats what the previous owner tells you. Unless there are specific stampings telling you otherwise (like its a 302 or 327) I would just assume it's a standard or possibly bored out 350. Just call it a 5.7 liter and call it a day! Drive it and enjoy it :thumbsup:!