I need to know a part number for felpro O-port header gaskets that will match up to the bolt holes on an LT1 motor. I have O-port jet hot long tubes and the D-port 1406 felpro gaskets are leaking because of an improper seal/fitiment issue. Also, will using O-port gaskets somehow be worse on performance and/or gas mileage?

 

ttt for today

 

Probably FPP-1426 for "round" 1.59" dia.

 

I couldnt find any gaskets to match up well to my AFRs and pacesetters, so used high temp RTV and make sure the bolts stay tight. I would guess if the bolts get loose it could cause problems rubbing on the heads, but it seals really well.

 

thanks a lot bubba, I went and ordered these today and they should stop my leaks. thanks again!