PTV & Pushrod Length?
06-14-2011, 11:50 PM
#1
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PTV & Pushrod Length? Hey guys I measured my PTV clearance with a stock .053 gasket its .095in & .103ex & the piston to head deck clearance is .063, I would like to put a .045 or .040 head gasket on this setup what do you guys think about the clearance I have?
Also my overall pushrod length measured 7.257 @ 0 lash so do I just add the lifter preload ( .050-.080)to get correct length and if I can change the gasket can I just subtract the thickness difference from overall length plus lifter preload?
Also my overall pushrod length measured 7.257 @ 0 lash so do I just add the lifter preload ( .050-.080)to get correct length and if I can change the gasket can I just subtract the thickness difference from overall length plus lifter preload?
06-15-2011, 07:36 AM
#3
ok first good idea goin with a thinner head gasket to lower the quench 
unfortunately that is also going to lower your ptv clearance to where ur gonna have to start fly cutting pistons, i've always thought it was .080 on the intake and .120 on the exhaust was safe.
and push rod length is definitely going to change
unfortunately that is also going to lower your ptv clearance to where ur gonna have to start fly cutting pistons, i've always thought it was .080 on the intake and .120 on the exhaust was safe.
and push rod length is definitely going to change
06-15-2011, 10:36 AM
#5
I agree with fastdriver on everything. If you go with the .040 headgasket you'll be right at minimum on intake but too close on exhaust. The exhaust will only get closer as the timing chain stretches with use. The engine will like the tighter quench so I would go with the .040 gasket and do the sandpaper glued to the valve head trick until you have about .120 again. There are a few good posts on here about how to do it.
If you have an extra exhaust valve you can also make a cutter by making chisel cuts around the perimiter of the valve head. round off the chisel cuts so you make a radius at the bottom of the relief cut in the piston, sharp corners can lead to fractures. Hand sand the relief cuts to smooth everything and you're ready to go.
If you have an extra exhaust valve you can also make a cutter by making chisel cuts around the perimiter of the valve head. round off the chisel cuts so you make a radius at the bottom of the relief cut in the piston, sharp corners can lead to fractures. Hand sand the relief cuts to smooth everything and you're ready to go.
