Thread: 307 chevy

Tweet

hi people,
im hoping someone can guide me in the right direction cos right now im wandering round like a blind man at a strip club...
i recently bought a 78' model fj40 4x4, really cheap. i found a 68 model 307 chevy under the bonet that needs rebuilding. ive heard a lot of negative feedback bout 307. but i havent given up on the little thing yet.
is there anything positive about having a 307.. i dont mind spending $$$ on it if the results will turn heads...

In my opinion, the 307 was General Motors way of using up the remaining 283 blocks and 327 cranks that were left over after they began producing the 350.

It's a garden-variety Chevy V8 that will produce respectable power (about 200 hp) in stock form and get respectable fuel mileage doing it, but you wouldn't want to choose it as a starting point for a performance build.

Tech.....you are probably right in a fashion.....there werent enough "remaining" blocks and cranks to build 307s for all those years BUT there was tooling to build the blocks and cranks and that tooling was available and probably idle otherwise. As I remember, in the 75-78 range, there was a shortage of 350 engines in the production schedule.....you had to wait longer for a 350 ordered whereas a 307 was delivered quicker.

Both the 307 and 305 engines were offered to fil the gap between the sixes and the 350.......for economy reasons. My experience with a 305 in a pickup was that a 350 improved the gas mileage (although both were factory 4bbl).

one of the man reasons i was going down that path was the fact that its already been converted to fit into the truck. would any other small block motor fit the same bellhousing as a 307?

Any other small or big block Chevy from 1955 to 1985.

so if put the 307 in a museum and bought myself an early model small block 350 it would fit the same bell housing? any particular s/b 350 chev ?

'68 to '85

ok then. thanks for your help techinspector.

Your 307 can probably be bored to 4", making a 327.

Originally posted by R Pope
Your 307 can probably be bored to 4", making a 327.

Yes it probably can be bored 0.125", but I wouldn't want to take a chance on the thin cylinder walls contributing to overheating.

Lots of 301's over the years had no problem with heating, as long as core shift wasn't evident.

ok