305, 307 and 350... differences

To the best of my memory, 305 and 350 share the same crankshaft, stroke, maybe heads but the 305 had a smaller bore, you can't bore a 305 to 350.

307 has the stroke of a 327 but a smaller bore, nothing in common with a 350. 327 had a 4 inch bore and you MIGHT be able to use it in place of a 350 block. But these are probably hard to find now.

Intakes and distributors swap pretty much from one to the other, but you need to know about the crossover plumbing and such.

There is a book that will answer all your questions, look for HOW TO REBUILD YOUR SMALL BLOCK CHEVY, it has a guy in a mechanic shirt putting an intake on a small block. Think of it as your bible when you work on small blocks.

The 305 is a small block only bored to about 3.75 but with a 350 crank (just under a 3.5 inch stock). The 307 is basically a old 283 with a

327 crank (3.875 bore and 3.25 stroke) The block has been updated some, mainly larger crank and rod journal diameters that have been standardized on the newer small blocks. THe 350 has a 4 inch bore and just under a 3.5 inch stroke. There was also the 327 which had a 4 inch bore and a 3.25 inch stroke (it was stroked about 1/4 inch to make the 350) and there was a 302 used from 67 to 70 in the Z28 which was basically a beefed up 327/350 block with a 283 beefed up crank. THere was also the 400 small block with had a 4.125 bore and approximately a 3 3/4 inch stroke. And finally the small block started life as a 265 in 1955

Heads are different >

Not true because except for the bore it is a 350 block/engine with a

327 crank which will fit >

No problem with this swap, you just need to use 350 pist>

No real surprizes here the only possible trouble you can get into here is that some of the older heads may not have the correct mount holes for some accessories such as A/C or alt brackets as they have changes mounting of these items over the years. (you could use a older style mount in some case though if need be)