322 heads

[old-tank]

Are there any differences in the heads of 54-55-56 322 engines?

Anyhow I found a NORS set of 0.030 oversize 56 pistons made by sealed power. A currently manufactured piston from Egge machine has a 1/8" lower dome (a set in one of my Centurys gives only 110# of cranking compression instead of 160-170#...it does run on regular gas but is a slug).

I know that the connecting rods on 54 and early 55 are different requiring a different wrist pin. If the 54 and 55 heads have the same part number I will use what I have, otherwise get a set of 56 heads.

Thanks in advance.

Willie

[1953mack]

1953, 1954, 1955, and 1956 heads all have 1.75" intake valves.

1953 and 1954 heads have 1.25" exhaust valves.

1955 and 1956 heads have 1.375" exhaust valves.

Go with the larger exhaust valves.

[old-tank]

Thanks for the reply. Do the 55 and 56 heads have the same part number? If the chamber is the same size these pistons will work in a 55.

Willie