Originally Posted by topside
Oh, it all may work fine and I might be worrying too much; kinda looks that way.
Could well be that Edelbrock's 5.125" dimension is "loose".
I really appreciate the info from you guys, thanks.


The 5.125" is a standard size, that said, it's generally the center of the mounting surface's dimension, it's not the OD or the ID, the correct gasket for the 5.125" air horn has an ID of 5.030" and an OD of 5.550" and there is usually a hair of gappage yet.