valve adjustment with diff cam
Thread Starter
Instructor
Joined: Jul 2008
Posts: 218
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From: Utah County Utah
valve adjustment with diff cam
can anyone tell me how many turns past zero valve lash my valves should be adjusted with a zz9 cam and everything else stock (except for the lifters of course). is it still standard 1.5 turns?
Le Mans Master
Joined: Feb 2000
Posts: 9,715
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From: Kempner Texas
When I ran the TPiS ZZ9 in a 355 CID TPI 86 Vette I set the preload at 1/2 (one half) turn past Zero lash using CompCams Hydrauic Roller Retro-Fit lifters. This was the CompCams recommended preload for those lifters and, also almost all of their other HR lifters too.
Remember, it's the lifters that call for a certain preload setting, not the cam. Different lifters can call for different preload recommendations. Comp's "R" lifters are an example which, last time I checked, called for .002"- .004" of preload - which "ain't" much at all.
Jake
Thread Starter
Instructor
Joined: Jul 2008
Posts: 218
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From: Utah County Utah
thanks, looks like i need to research some. its running pretty good right now but it has a little clatter. thats with one full turn past zero valve lash. i need to find out exactly what lifters i have, they came used with the engine.
Burning Brakes
Joined: Nov 2006
Posts: 1,102
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From: Portsmouth Virginia 396LT4 435RWHP/400RWTQ Best so far 11.26 @ 123mph
No, no, that's too many turns.
Remember, it's the lifters that call for a certain preload setting, not the cam. Different lifters can call for different preload recommendations. Comp's "R" lifters are an example which, last time I checked, called for .002"- .004" of preload - which "ain't" much at all.
Jake
Remember, it's the lifters that call for a certain preload setting, not the cam. Different lifters can call for different preload recommendations. Comp's "R" lifters are an example which, last time I checked, called for .002"- .004" of preload - which "ain't" much at all.
Jake
I currently run the Comp "R" lifters an it is only about half of a flat on the poly lock hex nut using 7/16"-20 studs.I ran the ZZ9 cam in my 383 and used 1/4 to 1/2 turn with standard CC roller lifters primarily because I drag race the car and turn it up to 6400 quite frequently. A half to 3/4 should be all that is necessary for normal driving conditions with standard roller lifters.
Rick
