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I imagine that the OEM gasket has oversized holes to ensure that no gasket ever blocked any part of the flow. The 60 thou gap between top and bottom halves that results is of no real consequence

Right way to do it

Shouldn't be, I've had one on my GLHT for years. Mine is 3/8" and I measured clearance by placing a wad of aluminum foil placed on top of the manifold and closing the hood. About 1" of clearance,...

Yes, phenolic.

Yeah, volume here ain't volume there. Respectfully, just what is the difference?

This spacer does add to total volume, and, that spacer allows for a far gentler short turn at...

Phenolic spacer between upper and lower of two piece IM

AJ = I have those 1" thick pieces of phenolic, pre cut in IM sized rectangles . . . . .?

Stock, there is a kink where the lower and upper meet; it is not a smooth arc. A 3/8" or even a 1/2" phenolic spacer plate adds some distance to help ya smooth that kink out as you open up the...