Not a 326 but a 1975 350. I had a 'ticker' and tried to cure it by tightening the nut. After that, it lost it's locking function and kept backing off. I replaced all of them with 3/8 polylocks with no subsequent problems.
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Frank M.
75 Firebird
68 Firebird 400 RAIII
66 Chevy II 461 Pontiac in AZ
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