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Re: 307 engine
Yes, I built a .030" over 327 for a 55 Chevy car using a 350 block and a 307 crank. Got the rotating assembly balanced, and the crank journal needed some weight added due the the heavier 327 pistons.
I think the only year that the 302 used a small journal crank was 1967. (327 block with 283 crank.) I know for sure the 69 model used a large journal crank in what was essentially a 350 block. That was a very stout bottom end due in part to the high overlap between rod and main journals.
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Mike
1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold
1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it!
1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!
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