- 29,948
- a baby, candy, it's like taking.
- TexRex72
The Oldsmobile small block with the bore of a big block and cylinder walls as thin as you'd expect? That 403?
Edit: The Olds 403 had a bore of 4.351 inches. By comparison, the Buick 455 big block (the most oversquare of the 455s) had a bore of 4.310 inches.
Last edited: