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Gearheads
Crank shaft lock?
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<blockquote data-quote="swampratt" data-source="post: 3195186" data-attributes="member: 15054"><p>did you remove the timing chain or loosen it.??</p><p>It takes very little slack to get the valve to hit a piston in some vehicles.</p><p>Normally you would have a minimum of .120" clearance for piston to valve contact.</p><p></p><p>Note that the piston is NOT all the way up the bore during this time when the valve is fully open.</p><p>You change where the crank and cam clocking is at and you will change piston to valve clearance.</p><p>1 tooth off it may hit.. or 1 tooth off the other direction and you could double the piston to valve clearance.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3195186, member: 15054"] did you remove the timing chain or loosen it.?? It takes very little slack to get the valve to hit a piston in some vehicles. Normally you would have a minimum of .120" clearance for piston to valve contact. Note that the piston is NOT all the way up the bore during this time when the valve is fully open. You change where the crank and cam clocking is at and you will change piston to valve clearance. 1 tooth off it may hit.. or 1 tooth off the other direction and you could double the piston to valve clearance. [/QUOTE]
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