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Original Message
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RE: cheap tricks |
By CWagner - 11/20/2000 10:31:44 PM; IP 205.242.224.169 |
I'm not looking for a fight, just trying to explain one possible reason for valve shims being under the rocker stands. Remember hydralic lifters have a large tolerance to compensate for production variations.Ford spec. calls for .100 to .200 clearance at the valve tip which back thru a 1.73 rocker translates to a minimum of .057 of collapse left in the lifter, much less than the .375 you feel it would take. It use to be a common practice to mill smog heads .060 to raise compression, which considering production tolerances would collapse the lifter and hold the valve open. It was used on 6 cylinder engines quite often also. So no, I don't understand what you are saying. From personal experience, not guessing, I know that it does not take a large cut on a FE head to collapse the lifters. And if you are not making much money on a rebuild you find every way possible to cut costs. |
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