Quote:
Originally Posted by quixotix
That brings up a follow-up question: When I look at the gland rings on Mike's, it says "For NEW Exhaust only". Any idea why it would say for NEW only?
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The majority of original exhaust manifolds have a "drooping" port on cylinder 4, causing them to fail to line up properly with the block. Sometimes these can still be used, if the gasket is strong, but gland rings won't work because the counterbores are no longer aligned.
If your manifold still has all six ports exactly aligned, gland rings should work for you unless your engine is one of the very small number not produced with counterbores in the exhaust.