Join Date: Aug 1998
Location: Waldorf Md. USA
Re: ZZ502 Lifter Pre-Load / Zero Lash
I personally hate the "pushrod stops turning" method in books. With new lifters that have not been filled with oil, you can tighten them down almost until the plunger is bottomed out and yet still turn the pushrod.
I always tell my customers to wiggle the pushrod up and down till they just feel that they have all of the play out, that is zero lash. Also, like Dave said, they usually will loosen up some as the lifter bleeds down.
By the way, be careful using the TDC method on all but the mildest camshafts. On most performance cams both valves will be slightly open at TDC and it is not the correct point to adjust them.
I always use the Exhaust Opening - Intake Closing method. When the exhaust valve just starts to open you adjust the intake, and when the Intake valve has opened all the way and then closed about 1/2 way ... that is when you adjust the exhaust. This is the method that almost all of the cam companies recommend.
Advanced Automotive Machine
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1971 Heavy Chevy - original owner
1984 Buick Riviera - original owner (Wife's car)
Team Chevelle #100