Reply to "Mysterious ‘China-wall’ gap"

The fact that the manifold bolt holes line-up should be a dead give away.

Lay one of the heads on a table, combustion chamber facing downward. Measure from the table top to the top of the intake port. If it is any amount significantly more than 3 inches, the port is raised. If its 3 inches then I am wrong.

(the head in the picture is a C302 race head)

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