bore= 4.125" stroke=3.75" multiply them like this, first get the circular area of the cylinder which is PI *r squared. so, pi (3.14159)x radius squared (half of the bore, squared)(2.0625)x(2.0625)= 13.3640. then multiply that by distance traveled, or stroke, so, 13.3640 x stroke (3.75) x number of cylinders (eight here) (8) = 400.92 cubic inches
The bore and stroke is different, But if you set the 2 side by side they will look the same other then some 400 engines have an extra freeze out plug in the side of the block that the 350 don't have. 350 bore and stroke is 4.000 bore,stroke is 3.480 400 bore is 4.125 and stroke is 3.750
bore and stroke a chevy 400 smallblock.
BORE is 3.740 and the stroke is 3.480
Bore 4.250" Stroke 4.00"
4.312 bore x 3.50 stroke.
4.00 bore 3.48 stroke
The bore would be 4.310" and the stroke is 4.00"
Bore 4.120 Stroke 3.75
4.000 inches -- same bore size as a Chevy 350, the difference is a 327 uses a 3.250 stroke and the 350 uses a 3.480 stroke.
The bore is 83mm (3.270"), stroke is 70mm (2.7559") total displacement is 379cc
4.25X4.56
If you mean the difference between the Pontiac 400 and 455....the differences are the bore size, the crank stroke length, and the main bearing journals. All are bigger on the 455. However, there is also a small block Chevy 400....which has nothing the same as the other two. The Pontiac 400 has a bore of 4.12, stroke 3.75 and 3" main journals. The 455 has a bore of 4.151, stroke of 4.21, and 3.25" main journals.