Thread: 283 with small journal 327 crank

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Originally Posted by tango

The SB Chevy 283 Block is standard 3.875" bore same size bore as a 307 L/J Block . The stock 283 uses the 3.000" Stroke crankshaft . By using the 3.250" Stroke Crankshaft and different pin height pistons Chevy made the 307 . How about your 283 bored 60+ over with 60 over 307 pistons and that 3.250" Crankshaft = 316ci Build . Not bad ? Or on some early 283's if they are check . They can be Punched out to a 4" bore and you could use standard 327 Pistons now you will have a S/J 327 Build .

3.25 is a 327 crank and it does make a 307 ..307 & 283 have the same bore

We used to race a dirt sportsman car with a 320 cubic inch limit. Our engines were 283 blocks with the 327 crank, Yes the same dimensions as a 307. We also ran .060 over and I think that was a 316-317 c.i. It was a pretty potent combination. The stock 307 had a pretty bad rap for being a serious dog. When I was a kid my dad had a new pickup with a 307 4 speed. It would go 100 in third gear and only 85 in fourth.lol.