????

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86 iroc,canary yellow,fully loaded

 

No, the bore of the cylinder is too small, it can only be stroked out to I think a 335.

 

If I hit the calculator buttons correctly (and I checked it twice), you'd need a 4.3" stroke to get 383 cubic inches out of a .030" over 305 block. Since a 350-based 383 uses 3.75" stroke and the block oil pan rails have to be ground for rod clearance, good luck getting that kind of stroke into a 305 block.

A .030" over, 3.75" stroke 305 is a 334.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

the biggest stroke i have seen in a SBC is a 4.0" stroke and thats in those 434ci monsters in dirt track cars. good luck if you try...