Hydraulic lifter pre-load
#3229333
04/26/24 02:22 PM
04/26/24 02:22 PM
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Joined: Mar 2003
Posts: 1,449
Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,449
Martinsville, IN
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We swapped heads and to Isky iron rockers and I’m trying to measure for new pushrods. The engine has a hydraulic .509 in it and I can’t seem to find the pre-load number for the lifters anywhere. Can someone please tell me what it is supposed to be?
eBay-cdwmotorsports
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Re: Hydraulic lifter pre-load
[Re: Diplomat360]
#3229434
04/27/24 08:50 AM
04/27/24 08:50 AM
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Joined: May 2005
Posts: 1,989
Apollo, PA.
B1MAXX
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top fuel
Joined: May 2005
Posts: 1,989
Apollo, PA.
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What lifters are you using?
I ask b/c some of them (the anti pump-up ones) will allow you to run a much tighter setup.
My SB favourite are the SpeedPro HT2011R, which are supposed to be installed with 0 (zero) preload. As in: tighten things down until the pushord stops spining/turning between your fingers.
Prior to switching to my current hydraulic roller setup that's what I used, and loved them! I have seen people take that as tighten the adjuster until you collapse all the preload and make it so tight you CAN'T turn the pushrod. lol 
Last edited by B1MAXX; 04/27/24 08:50 AM.
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Re: Hydraulic lifter pre-load
[Re: B1MAXX]
#3229513
04/27/24 02:49 PM
04/27/24 02:49 PM
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Joined: Jan 2004
Posts: 8,270
fredericksburg,va
cudaman1969
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master
Joined: Jan 2004
Posts: 8,270
fredericksburg,va
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With my .509 (383) I did zero lash with Isky rockers, tighten till pushrod stops turning, 6800 easy all day
You know ‘preload’ is a built in rev limiter to ‘save’ your engine
Last edited by cudaman1969; 04/27/24 02:52 PM.
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Re: Hydraulic lifter pre-load
[Re: fast68plymouth]
#3229601
04/27/24 10:22 PM
04/27/24 10:22 PM
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Joined: Aug 2003
Posts: 43,190
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,190
Bend,OR USA
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Standard lifters should get .030-.040” preload. How about all iron motor compared too iron block with aluminum heads and then aluminum block and heads  ?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Hydraulic lifter pre-load
[Re: B1MAXX]
#3229698
04/28/24 11:31 AM
04/28/24 11:31 AM
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Joined: Jan 2003
Posts: 1,760
Windsor, ON, Canada
Diplomat360
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Windsor, ON, Canada
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I have seen people take that as tighten the adjuster until you collapse all the preload and make it so tight you CAN'T turn the pushrod. lol I honestly can't understand why someone would conclude that is the right setup, given that they are working with adjustable rocker arms already so presumably they must know a little more about valvetrain than the proverbial uninitiated! lol Still...I have no doubt this does happen, and have in fact seen numerous such on-line posts as I investigated the whole topic during my move to the hydraulic roller setup. Even those (which are Comp Cam pieces) I ended up setting up with just 1/4 turn preload.
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Re: Hydraulic lifter pre-load
[Re: Diplomat360]
#3229817
04/28/24 07:54 PM
04/28/24 07:54 PM
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Joined: Mar 2003
Posts: 1,449
Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,449
Martinsville, IN
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Ok so am I under thinking this process? Can i just snug up the checking pushrod against the lifter and the adjustable rocker? and use that measurement -.030? This is all new territory for me, the BB has always just had iron heads, stock rockers and pushrods. I don't want to not complete Dragweek and don't have billions to continually throw at valvetrain parts. Also since the Stealth's only accept 5/16" pushrods without modifications should i do the .118 wall Manton's? The only other Series 3 option at Manton is a .083" wall pushrod
Last edited by cdwmotorsports; 04/28/24 10:00 PM.
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Re: Hydraulic lifter pre-load
[Re: cdwmotorsports]
#3230025
04/29/24 04:38 PM
04/29/24 04:38 PM
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Joined: Jan 2003
Posts: 3,922
Richmond, Indiana
19swinger70
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Joined: Jan 2003
Posts: 3,922
Richmond, Indiana
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Ok so am I under thinking this process? Can i just snug up the checking pushrod against the lifter and the adjustable rocker? and use that measurement -.030? This is all new territory for me, the BB has always just had iron heads, stock rockers and pushrods. I don't want to not complete Dragweek and don't have billions to continually throw at valvetrain parts. Also since the Stealth's only accept 5/16" pushrods without modifications should i do the .118 wall Manton's? The only other Series 3 option at Manton is a .083" wall pushrod If you are measuring for pushrods, snug the adjuster up with the pushrods until you can just barely feel the pushrod resist turning with your finger. Take that measurement, then ADD your preload to the length of the checking rod for your actual pushrod length. (basically, what you have above, but ADD the preload to your pushrod measurement)
Last edited by 19swinger70; 04/29/24 04:45 PM.
1970 340 swinger. sublime
1967 barracuda fastback BB
55 Plymouth Project
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