| hardened exhaust valve seats [message #361063] |
Mon, 21 December 2020 14:44  |
rgogan
Messages: 82
Registered: February 2004
Location: Milwaukee, WI
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I purchased a used J head from a 1975 Oldsmobile Cutlass 455. The rebuilder that I am using cannot tell if the exhaust seats were induction hardened during the original build. He can install hardened seats if I insist but he is concerned that can open up a can of worms. Any engine overheating or exhaust restriction will cause the seat to become undone in the head. This already happened to me in my air cooled Briggs and Stratton riding lawn tractor. Mice had built a nest under the air cooling baffles and the engine over heated and the hardened seats popped out. Tried some internet magic epoxy to rebed the seats but the fix lasted for only one trip around the lawn.
Does anyone know if GM was supplying J-heads with hardened exhaust valve seats in 1975 so I don't have to deal with this problem?
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