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Old 09-23-2005, 12:40 PM
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Piston Stop, No Directions

I just got a Spark Plug Hole Piston Stop
to locate TDC
I has no directions and it is adjustable
How far down in the hole should it be.
Thanks ,
BDEF
Chevy Small Block -350

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Old 09-23-2005, 01:23 PM
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It only needs to be far enough down to stop the piston prior to TDC. What are you trying to do? Verify harmonic balancer position versus timing pointer? If so then roll the motor over to 5 to 10 after tdc, or before TDC and install piston stop and lightly bottom it against the piston. Roll the motor over the opposite direction and note position on the balancer when lightly seated on the stop. Roll the motor over the other way, again, and note position on balancer. Split the dif and that's TDC. Adjust pointer and reverify.

Last edited by Rick WI; 09-23-2005 at 01:29 PM.
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Old 09-23-2005, 01:44 PM
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Someone put a 305 blancer on a 350
the timing marks are at 3 or 4 oclock
when tdc is at 12
thanks,
big dawg
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Old 09-23-2005, 01:58 PM
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Are you sure there are different balancers of a 305 and 350? You might want to check to see if the balancer has spun or slipped a little. This did happen to me. The balancer has a rubber center that can break and allow the outer ring to move thus moving the timming mark. My brother had a heck of a time timming my truck. I forgot to mention to him that a mechanic told me the balancer had moved.
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