Piston to valve Clearence?!?!?

[Rick 91GT]

Originally posted by Smokedawg:
Ok..Go to your nearest auto dealer and ask for plastigage. Its less that 2 bucks..it looks like a piece of fishing string but different colors for different sizes. You use that to check your piston to valve clearance.

HUH? I don't want to start a pissing battle but....He isn't checking bearing clearances he need to check PTV clearance. I have never seen plastiguge thats .100" thick?

I use modeling clay. Put some WD-40 on the piston and valves so the modeling clay will not stick to them and put the modeling clay on the notch or relieved areas. Bolt the head down snug then turn the motor over using a strong arm on the crank bolt, if you feel any strong resistance STOP!!! that may mean your valve is hitting the piston. After you turn the motor over take the heads off and use a set of calipers to mic the depth of the relief through the lowest part in the clay add your compressed thickness of you heads gasket and then you have your PTV, .100 is a perferred minimum.


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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98

[This message has been edited by Rick 91GT (edited 03-01-2001).]