Port my current M1 single plane or install the RPM Air Gap?

4mulas said

Best I have right now For pictures. Also including the one showing epoxy as warning to folks with these. This manifold is for my 402 magnum and the factory drilled the inner holes too deep on 3 out of the four holes and they went right through, they will cause a vacuum leak unless those locations are actually being used.

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A member emailed me some nice pictures and I thought I was going to get a job porting one but so far I haven’t heard back. The RPM is the one that interests me because my son has both a 340 and currently a built 360 in his 1973 Cuda. I’m going to finish up his Speedmaster heads one of these days and I think with the air in Colorado that may be a good intake for him. I did a post on “the ugly” Torquer intake I ported for him and it flowed better than I could get the Speedmaster dual plane to flow.