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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The one with the epoxy that broke is probably mine. We used Moroso AB epoxy. FYI, I also run California blend gas too with alcohol content.

Someone later did one in epoxy with metal dowel on the side to support it. That was a years ago. Never heard anything bad with that.

Buddy did a RB M1 since then... TIG welded that one.
Read here: Looking for opinions on Mopar M1 single plane intake

Mine before a slice of epoxy came off and hung up a valve and pushrod fell off the rocker.