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I rebuilt a 307 engine and in the process installed a 350HP/327 camshaft. After tearing the engine down at about 20,000 miles to install a milder camshaft I noticed the #5 exhaust lobe was starting to go bad. I installed a milder Lunati camshaft and run the motor another 15,000 miles or so. The motor was running fine but I pulled it out and put in another engine. The 307 sat in the corner of the garage for several years, and now I decided to put it in another Camaro, but when I tore it down to freshen it up, I noticed the #5 exhaust lobe is starting to go bad. The lifter has started cupping, but it is symmetrical, so it looks like it is rotating. Does anybody know what might be causing this? Is there anything unusual about the #5 exhaust lobe and lifter? Thanks.

Doug
 

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I would suspect tight lifter bore, perhaps not letting lifter rotate as much as it should. Alternatively, oil galley could be plugged a little. Or perhaps valve is sticking (or bent) causing excess strain on the lobe.

Gotta be one of those. #5 exhaust valve is same as all the others. If you had only wiped one cam, then I might just suspect improper break-in, but for the same lobe to wear down two times in a row, means you gotta problem in there................

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