L98 vs LS7 lifters
09-18-2014, 10:46 AM
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Car: 1989 IROC & ROLL-Z
Engine: L98 Vortec FIRST TPI
Transmission: T56, Mech Speedo
Axle/Gears: G92 J65 3.27
L98 vs LS7 lifters
Measured my stock L98 lifters with 215,xxx miles on them vs new LS7 lifters I purchased, wanted to post what I found.
From what I can see, these will work fine despite the raised pushrod cup.
With these measurements, you could also calculate the exact correct preload based on the threads per inch of the rocker stud you are using.
From GMpartsdirect:
DESCRIPTION: LIFTER PK
• Set of 16 lifters for LS-Series engines
• Same lifter used in LS2 and LS7 P/N 17122490 (single lifter)
Cup to top of lifter measurements.
L98:
Extended .340"
Depressed .480"
Total movement: .140"
LS7:
Extended .282"
Depressed .495"
Total movement: .213"
All other measurements are the same.
L98 lifter
LS7 Lifter
From what I can see, these will work fine despite the raised pushrod cup.
With these measurements, you could also calculate the exact correct preload based on the threads per inch of the rocker stud you are using.
From GMpartsdirect:
DESCRIPTION: LIFTER PK
• Set of 16 lifters for LS-Series engines
• Same lifter used in LS2 and LS7 P/N 17122490 (single lifter)
Cup to top of lifter measurements.
L98:
Extended .340"
Depressed .480"
Total movement: .140"
LS7:
Extended .282"
Depressed .495"
Total movement: .213"
All other measurements are the same.
L98 lifter
LS7 Lifter
Last edited by Keoman; 09-18-2014 at 10:49 AM.
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