Valve Lash Measurement
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Joined: Sep 2009
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From: Long Island NY
Car: 92 Camaro RS
Engine: 77' 350 bored 355 Holley carb
Transmission: Turbo 350
Valve Lash Measurement
Have a 92 rs tbi. po put a 77 350w/ carb. ive done valve adjustments by hand. saw you can do with feeler gauge. does anyone know what the "measurement" for the proper feeler gauge would be. been looking cant find a number. thanks
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Valve Lash Measurement
Hydraulic lifters don't use a feeler gauge except if you want to use it to determine zero lash.
With the lifter on the base circle of the cam, you adjust the rocker to zero lash. You can use a .001-.0015 feeler gauge to do this if you want. You then tighten the rocker nut 1/4-1/2 turn more to set a preload in the lifter. The hydraulic lifter allows some tolerance but the adjustment can be measured with a dial gauge. The 1/4 - 1/2 turn is setting a .020 - .040" preload in the lifter.
With the lifter on the base circle of the cam, you adjust the rocker to zero lash. You can use a .001-.0015 feeler gauge to do this if you want. You then tighten the rocker nut 1/4-1/2 turn more to set a preload in the lifter. The hydraulic lifter allows some tolerance but the adjustment can be measured with a dial gauge. The 1/4 - 1/2 turn is setting a .020 - .040" preload in the lifter.
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