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
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
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Heads are different in that they have smaller combustion chambers and
valves. You woul not want to use them on a 302/327/350/400 though they
would bolt on they would limt performance and could cause too high of
compression on some engine too (depending on pistons too) You should
be able to maybe bore it to a 307 piston bore (3.875) but you would
need specail rods (shorter) or custom pistons for correct compression
Not true because except for the bore it is a 350 block/engine with a
327 crank which will fit in a 350 motor and make it a 327 too.
No problem with this swap, you just need to use 350 pistons because of
longer stroke for correct compression height. It is the same block.
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)
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