I'm told that the oem collector was only 2". Does anybody know what size hole each primary has ?
I never even measured mine... b4 I tossed them into the bin.
I happen to have exhaust manufolds off on the bench. 4.6l 3v. The collector is about 2" and the "D" shaped ports on the head side are about 1.38" x 1.46". There is some variance between ports but that is close enough for government work...
