EVERY aftermarket pan uses this same pan as a core. Milodon(my leak-dropped the pan in the car added liberal gorilla snot and fairly well sealed) Moroso and Canton. They copied it from Pontiac I believe from 71-73 or so. So you can thank Pontiac engineers for that design.
Alos if you even just lay the 3 tit piece on the cap or the pan everyone I have is a hair longer and will not stay on a straight line with the bolt holes lined up, so it has to move and the half round edge lets it creep easily.
I personally convert all my 3 tit pans to 5 tit late model seals with a Dremel. No problems with my current Canton done that way.
Lots of posts here on how to fix the original Pontiac design.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
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