Re: PM-7 question??
I think the poor performer tag came about when Hot Rod magazine did a manifold shoot out a few years back. In their testing, it performed poorly. That said, thousands of folks have run them and had good running motors.
If you like it and have it, run it. I have one as well. I checked and mine does not have that plug. It does look like a by-product of the casting process.
They look great in a '32 engine bay for they fill up the space nicely.
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