Which block do i have?
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Measure the piston bore or the dimensions between pistons (bore spacing).
Nominal dimensions:
=================
Bore: 351M/400 == 4.00; 429/460 == 4.36
Bore spacing: 351M/400 == 4.38; 429/460 == 4.90
The 429/460 block is MUCH larger.
p.s. The 302/351W/351M/351C/400 all share the same bore and bore spacing. The 429/460 and the 351M/400 both have a similar deck height ~10.3".
You can find all of these dimensions in the back of Ford Motorsport catalogs available at your Ford dealer.
Nominal dimensions:
=================
Bore: 351M/400 == 4.00; 429/460 == 4.36
Bore spacing: 351M/400 == 4.38; 429/460 == 4.90
The 429/460 block is MUCH larger.
p.s. The 302/351W/351M/351C/400 all share the same bore and bore spacing. The 429/460 and the 351M/400 both have a similar deck height ~10.3".
You can find all of these dimensions in the back of Ford Motorsport catalogs available at your Ford dealer.
