348 Chevy broken rocker arm stud - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-16-2002, 03:54 PM
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Post 348 Chevy broken rocker arm stud

I overhauled a 348 last year. This engine is the original stocker in a 58 Impala. It has about 500 miles on it, it has always ran well {no missing out or lifter noise, ect. One of the rocker studs was broken off flush with the bottom of the adjusting lock nut. I was told that 348s and 409s were a little prone to valvetrain problems, but I really can't figure out why the stud broke unless it's just metal fatigue. The cam is stock as well as the springs. Any suggestions? No stuck valves either, could the owner have screamed it a little, or just tired studs?
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Old 12-16-2002, 04:56 PM
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I`d say fatiqued, 44 years old is a long time for any part, especially one that see`s much stress as a rocker stud.
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