05-06-2006, 06:06 PM
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CC Member
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Join Date: Jul 2004
Location: Alpharetta,
GA
Cobra Make, Engine: ERA #414 427 s/o w. Shelby Aluminum heads, Edelbrock Performer RPM Intake, Mighty Demon 750, Tremec TKO 600
Posts: 714
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Not Ranked
Well I think I've fixed it. Bought and installed the Byson header gaskets mentioned here, and then took some of the Permatex hi-temp copper gasket sealer and smeared a good coat inside the collector ends - about 1" deep into the pipes. Slipped it back together and tightened up the connector bolts, then tightened up the headers to the heads. Took it for a test run and no back-fire! Question now is, how long will the gasket sealer hold up, and how much of the issue was at the collector vs the heads. Could see clear indication where I was getting blow by with the copper gaskets, but I haven't changed out the copper gasket or sealed the collector connections on the driver side and not getting any problem on that side.
Thanks for all the advice! Now I'll probably start mucking with tuning the Demon carb since I've got a lot higher flow on the heads and 150 more HP than I started with. However, no noticable issue in the way the car is running.
Thanks!
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