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Author Topic:   Wanting to build a SBC 383
posted July 28, 2004 01:16 AM
Can anyone tell me the number on a SBC383
such as bore and stroke and what size block to build it from.

R.F.Rielly Motorsports
Blood Sweat and Beers

posted July 28, 2004 02:55 AM
350 block, 400 crank

4.030" bore, 3.750" stroke.

posted July 28, 2004 10:10 AM
Since you're asking a basic question I'll elaborate a little on the response.

Back in the "old days" a 383 was made with the following combination of parts:

- 350 Engine Block that is bored .030 over
- 400 Crankshaft with the main journals turned down to fit the 350 bearing size (this was the expensive operation)
- 400 rods
- 350 .030 pistons
- 400 externally balanced flexplate and harmonic balancer

There are much better ways to build a 383 now using an aftermarket crank that doesn't have to be ground down, 5.7 rods and inexpensive specific '383' pistons - or my personal favorite - the internally balanced crank, 6" rods & matchin pistons - then you can use the neutral balance 350 stuff - and it's much harder to detect than just looking at the balancer/flexplate for the counterweighting.

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