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Original Message
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RE: Valve train noise |
By Greg Westphall - 10/27/2003 8:46:05 AM; IP 12.158.13.35 |
It is true what you say regarding the expansion rate of aluminum but remember, the pedestals are held captive by the rocker shaft bolts. The expansion that you are speaking of will occur but to a much lesser degree because the stiffness of the bolt will prevent full expansion. In any case, the cylinder head in my application is made of aluminum and although it is held captive by head bolts there is enough area to expand around them. You are correct though that the cold lash should be set .004 -.006" tighter when dealing with aluminum heads tied to an iron block. This number nearly doubles when bolting aluminum heads to an aluminum block. Thanks for the feedback. |
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