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Old 04-10-2008, 09:09 PM   #1
W72
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1/2 or 3/4 lifter preload? roller lifters

Okay, what's best? 1/2 turn or 3/4 turn after zero lash for lifter preload. Or do folks use the factory manual setting of "one full turn" after zero lash.

I've read many threads with references to all 3 but no definitive answer.


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Old 04-10-2008, 09:51 PM   #2
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Re: 1/2 or 3/4 lifter preload? roller lifters

1/2 turn is fine.
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Old 04-10-2008, 10:58 PM   #3
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Re: 1/2 or 3/4 lifter preload? roller lifters

1/2 turn sets the .030" preload in the lifter and will be fine.
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Old 04-11-2008, 01:31 AM   #4
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Unless you're crutching something, you won't see any difference between 1/2 turn, 3/4 turn, and 1 full turn.

The good ol' boy engine builder fellow racer I talk to who seems to know every cheap trick out there, and not only that but also what works and what doesn't, uses factory roller blocks for his roots-blown 383's, and sets Chevy hydraulic lifters, flat or roller, at 1 full turn down.
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Old 04-11-2008, 07:21 AM   #5
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Re: 1/2 or 3/4 lifter preload? roller lifters

Okay!! That's what I need to know!

1/2 turn down is it!

Thanks fellas.
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Old 04-11-2008, 01:42 PM   #6
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Re: 1/2 or 3/4 lifter preload? roller lifters

I have mine set at 1/3 down with retro-roller lifters. No valvetrain noise.
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Old 04-12-2008, 11:37 AM   #7
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Re: 1/2 or 3/4 lifter preload? roller lifters

way too much time and concentration involved

get em close

start the motor and wear some good gloves that are made of leather that you dont mind getting oil on

adjust the rocker untill the tip of the rocker has good resistance to you moving the tip across the top of the valve from side to side

what I mean is grab the very front of the rocker arm with your thumb and forefinger and move it from side to side sliding it across the valve

there should not be any play here but the rocker should still move slighly

you will get the hang of it quickly- dont worry the rocker will not jump up and bite you

this will adjust the valve lash perfectly

spray your engine compartment down with cleaner and take it to the carwash

look out for cops before you stomp on it because your engine will be way more dialed in that any other valve lash technique

third gens are the shiznezel
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Old 04-12-2008, 01:12 PM   #8
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Re: 1/2 or 3/4 lifter preload? roller lifters

when i built the 350 for my S-10 i set them at 1/2 turn. after i drove it for a week i noticed they started to make noise at higher RPM so i added 1/4 turn and they are now nice and quiet.
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Old 04-13-2008, 10:31 PM   #9
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Re: 1/2 or 3/4 lifter preload? roller lifters

This will help for max power out put.

http://www.gofastnews.com/board/tech...g-max-rpm.html
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Old 04-14-2008, 08:03 AM   #10
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Re: 1/2 or 3/4 lifter preload? roller lifters

i have crane factory replacement roller hydraulic lifters
comp magnum rockers with pollylocks
and springs that are up to the task
i go to 0 lash and 1/16 turn
i can go 6500 rpm all day
my dyno guy told me to do this
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Old 04-14-2008, 08:03 AM
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