The ID/Code is located on the top of the left center exhaust port on each
All used shaft mounted rockers.
Code Year(s) CID CCs Number Notes
16 1957 371
23 1964 394 Seen on 394.
Intake, Exhaust Port Sizes
1954 and 1955 324s' have smaller intake ports and valves than the 1956
engines. 1957 and later cylinder heads
will physically bolt on to 1949 to 1956 engines, but the port matchup on
intake maniflolds will be off because different cylinder deck heights are used.
1957 and later cylinder heads have larger coumbustion chambers and valves.
[ Thanks to [email protected] for this information ]
Combustion Chambers, CC's, Interchange