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| The 2000+ rpms insures that adequate oil is being thrown at the lobes while also allowing the lifters to slide and spin easier over the lobes. At a lower rpm, the lifters will tend to drag or scrape over the lobes with a higher grinding pressure which can accelerate cam and lifter wear. The higher rpms helps to ‘burnish’ the lobes on a new cam so the lifters slide easier over them. Once this polishing effect has taken place, then the camshaft can tolerate the lower rpms without as much risk of the lobes or lifters wiping out prematurely. If for any reason, the full twenty minutes of breakin time must be cut short for whatever reason (usually overheating), then finish out the remaining time when the engine is restarted. Ie. If the engine is cut off at the twelve minute point, it still needs eight minutes of cam breakin. It’s very important that the engine with a new camshaft fire off immediately as any excessive grinding on the starter is detrimental to the camshaft and lifters. This means having the carburetor already full of fuel and the distributor timed close enough to fire up right away.
  Lorena, Texas (South of Waco)
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| | Thanks for that Ted, it all makes sense now. Regards Peter.
 Hang loose and enjoy the ride.Brisbane Australia |
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