what causes cam lobes to round off?
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Joined: Jul 1999
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
Lifter bore misalignment to the cam (very common in older blocks), over-revving with inadequate valve springs, too much cam with inadequate valve springs
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Joined: May 2002
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From: Fredericksburg, VA
Car: '84 Z28
Engine: 350
Transmission: th2004r
i'm thinking it could be misaligned lifter bores. with the new cam i havn't even reved it much, the old can was real small, and the new cam is a comp XE262. i wouldn't think it could be the valve springs because its both on only the #8 cylinder, but i guess its a posibility.
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Joined: Sep 2001
Posts: 6,111
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From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
On a flat tappet cam/ valvetrain setup the lifter spins in the bore and the cam lifts it up and down.
If something causes the lifter to not be able to spin in its bore the lifter face and cam lobe will soon fail.
If something causes the lifter to not be able to spin in its bore the lifter face and cam lobe will soon fail.
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From: Pueblo Co
Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
I'd say on a smaller cam like that it was an installer problem. Of course it wouldent be the first time a comp cam that was installed correctly went flat.
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Senior Member
Joined: May 2002
Posts: 636
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From: Fredericksburg, VA
Car: '84 Z28
Engine: 350
Transmission: th2004r
i think its bad cam bearings. thats the only thing that would have much to do with the oil pressure and it would explain the lobes going flat if the cam is moving around.
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