Yes, AMC used doughnuts on Gremlin 6, I had one new for wife. Every 10k-15k miles a leak started . Quickly gets worse. Maybe a mechanic tried to put one on a 300----head pipe on Mopar has to be bent right, square to manifold flange , and attached firmly with hard gasket, it generally never leaks there. Today’s high end gaskets tend to be a metal matrix for that. Much better than yesterday’s. Maybe a patch job was done with donuts due to slightly incorrect head pipe flange bend? I took to using one size down stainless bolts and nuts on far side rather than the exhaust manifold tappings –you know why. While on this never ever hang exhaust pipes from exhaust manifold flange while working on it, or installing it ; head pipe alone might be ok, but issue is the bolt flange WILL snap off the manifold if you hang mufflers etc by head pipe, and then try to move around. Pipe has a lot of leverage on that small flange. . Ram F exhaust manifold was the victim, , of course, ----cannot be had anywhere. From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Scooter465@xxxxxxx [Chrysler300]
Thing. Mopar used flat steel Gaskets big blocks. Or ball And socket flange small blocks. Ball and socket is the best no Gaskets to burn out. Bob Haag Sent from my iPhone
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