HI there,
The valve clearance is very important to maintain a good tune and as the valve wears and beds into its seat the clearance can decrease with out correct clearance you can burn a valve and this is an expensive repair, have the clearances adjusted, just one thing, these according to Michell are manual adjusted rockers and not hydraulics, hydraulics don't get adjusted.
Mark (mhpautos)
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Monday, November 30th, 2009 AT 5:52 PM