You have picked the wrong pistons. The compression ratio will end up way too high.
You want a low low compression ratio 7.5:1 ~ 8:1
its is much easier to build a 355 based blower motor with the correct low compression ratio using of the shelf parts.
A 355 build correctly with 7.5:1 cr will allow much more boost and timing and make more horsepower than a 383 buildt wrong with the wrong compression ratio
that will be limited/crippled by limited boost on pump gas.
Build a 355 SBC with 70-75+cc heads (EG: AFR #1036 w/valve spring upgrade) and -22CC dished forged blower/turbo pistons. This allows serious 10-12# boost and big RELIABLE horsepower on 92+ octane pump gas.
Use a mechanical street roller cam and a 850-950cfm carb
Crane Cam # 118521 or #118531 is a good example of the cam to run.
2.10 to 2.28:1 blower drive ratio, good premium.pump gas
A similar build 383 with low compression requires a -30 to -35cc dished piston.
Low engine compression ratio is key to making big street power with this 177 blower on pump gas.
Last edited by F-BIRD'88; 07-28-2012 at 05:26 PM.