[BVR421]

Pontiac jack sez: Have you talked with the manufacturer Best Gasket Company?

My experience. When I contacted Best a couple years ago to inquire why they list a 1967 428 seal as the same as a 1967 400 seal while the 1968 428 seal is listed as the same as a 455 ????? they said in so many words to mind my own business, unless "I thought I was smarter than Felpro"

Tom V sez: My vote would be that you got a 400 seal vs a 455 seal from Best Gasket or if they sent both gaskets that you had a brain fade and used the wrong one.

I wonder too. Im really not "smarter than Felpro", but I know a big journal seal is different from a small journal seal. Not just the diameter but the thickness of the rope. At least on factory type seals they are and folks have actually cracked rear main caps when tightening over the wrong rope seal. You can hold them in your hand and see they are different. I thought it might not be too good to get them mixed up. Maybe the Best is a one size fits all with different part numbers for different main diameters? I dont think so.
Best seal product might be great but I dont trust the Best humans at all.