the 360 l.a. engin came fatory with a 4" bore
a 400 small block Chevy has a 4.125" bore.
3.740 inches
4.155"
4.125"
4inch bore 3.25 stroke formula bore x bore times stroke times .7854= cid
A small block Chevy has a 4inch bore. When you bore one 30 what you are doing is removing .30 thousandths from the cylinder. That would make the bore 4.030 or turn a 350cid into a 355cid.
This is the diameter of the cylinder hole in the engine block for the pistons.
this is the diameter of the cylinder hole in the engine block for the piston
NO the bore / cylinder size is different. Pluse the stroke
get a big block or bore it 54 over
The stock bore was 4.125". The bore of a 406 would be 4.155"
4.125"