Common Procomp crosswind intake manifold problem.

IQ52 said

Yep, good question.

What year standard block and heads? 273 heads perhaps?

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Exactly what I was thinking. Look like the early 273 heads to me w the diff intake bolt angle. I have used a few crosswind/knock off intakes w no problems at all. My RPM air gap actually had more core shift than the cheapies.