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I have built a 496 bbc. it has wiped out 3 roller cams. it is a 1980's 454 block. valve springs were checked for pressure. no coil bind with the lift cam i was running. it has happened twice on the #8 ex and once on the #7 ex. the car runs good for about 100 miles and then the bar that holds the two rollers together breaks and the rollers spin and wipe out the cam. i have heard that i could have a problem with the lifter bores not being straight. i am frustrated and confused. thanks

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Are you using hydraulic roller lifters? Try switching to a flat tappet system. Make sure to use plenty of cam lube on the lobes and to do a proper 20 minute at 2000 rpm break in. Recheck all your valve train geometry valve lash and rod length. If everything was done correctly your lifters should have never spun.

Posted on Nov 08, 2010

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