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MG MGA - 1800 exhaust sealing

I have a Moss 3 into 2 into 1 extractor exhaust manifold on my MGA (fitted to my MGB engine) and it works fine. However, every few months it begins to blow by at the join of the 2 into 1 "Y" section.
I have tried various exhaust sealers and changed the exhaust clamps a couple of times but, after each fix, it happens again.
It is probably caused by engine movement but I wonder if anyone else has experienced this issue and have you managed to cure it.

Colyn Firth

This thread was discussed on 25/03/2011

MG MGA index

This thread is from the archive. The Live MG MGA BBS is active now.