AIR exhaust manifolds

Mike, yearone sell exhaust manifolds with air holes.As amatter of fact it is hard to find exhaust manifolds without the aie holes unless they are used ones. Have not found a company that has non air hole manifolds. BILL

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This may not be accurate, but I thought that generally all big block manifolds after '65 were drilled for a.i.r., and had bolts screwed in place when the pump was not present. Only the '65s were undrilled.

I am running a set of BBC manifolds from a 72 Impala 402. They were not drilled and tapped for the smog tubes. Some cars were drilled and tapped, others weren't.

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