Mike I have an original HO pan on one motor and I bought a trap door form Canton and copied one for another motor in the 81 TA. I did find when using the HO pan autocrossing with road race tires a "stop box" at the end where you had to stop hard would drop the pressure some, but corners no problems.
I never had any luck sealing 3 tab pans. Seal was half round so it would slip easily and it seemed 1/8" too long so it was starting to move just laying it on the pan. I use a dremel to convert them to a 5 tab and use the flat 5 tab seal. Most aftermarket pans are 3 tabs.
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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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