Re: Square Flange headers ID?
I'm pretty sure that my '68 Firebird had square flange headers on it when I bought the car in May of '68. I never had any problems with them and never did know what brand they were. They can weld up headers in a jig, but I wonder if they ever check to see what shape the headers take after they have been run through a few heat cycles. The collector can move quite a bit in relation to the car around it. The first headers we put on the Chevelle worked fine for a couple of days, then I couldn't get the transmission into reverse. The collector had moved enough to be interfering with the shift linkage on the transmission. It happens when any weldment is stress relieved.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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