I can only speak for round port Hedmans in a second gen. The 1 3/4 tubes both sides hit the firewall BAD no way they would ever fit. Sent them back to Hedman-"fit's our jig you must have moved the engine back in the frame". I wanted that size for that motor so we cut off 2 tubes each side and made our own.We also straightend the angle of the collector out as it opinted uop at the floorboards.
Tried a set of theit 1 7/8 -collectors pointed at the tranny -they at least corrected that when I sent them back.
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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 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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