Quote:
Originally Posted by scicala
'55 and '56 heads had the same sized ports. '57 is when the intake ports got larger in the heads and intake. The ECZ-B '57 intake will still work on a '55 and '56 head. The '54 heads are the ones that are with extra small ports and will not work.
Sal
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Yes, what Sal said.
Intake to head, the smaller '54 gasket size compared to later gasket...
Also, there is a version of the intake gasket with a smaller hole for the exhaust crossover, it helps prevent paint burn-off on the intake manifold.