Buick Oldsmobile Pontiac V8 HT951 Valve lifter are 100% Rockwell tested. .842 or 27/32 dia Buick 1964-84 Oldsmobile 350-455 1965-79 Pontiac 326-455, Interchange
TO BE USED AS A GUIDE ONLY - Application Must Be Verified
AE CLEVITE
H951
DANA/PERFECT CIRCLE
2131674
DYNAGEAR/MANLEY
ML951H
ELGIN
HL1951
ENGINETECH
L951
FEDERAL MOGUL/SEALED POWER
HT951
GM
17085567
GM
5231355
GM
5231360
GM
5231615
GM
5232265
GM
5232320
GM
5232375
GM
5232385
GM
5232570
GM
5232575
GM
5232675
GM
5232750
GM
5232755
GM
5232780
GM
5232895
GM
5232900
MELLING
JB951
MORESA
H304
PIONEER
VT951
STANADYNE
12304
TRW
VL49
WOLVERINE
HL1951
Sealed Power Hydraulic Valve Lifters
The basic function of a hydraulic lifter is to ride up and down on the cam lobe and open the valves when the cam rotates. Sounds simple doesn't it? Wrong !
The hydraulic lifter is one of the most complex components of an internal engine, with a multitude of moving parts with the main purpose of maintaining zero lash. When the camshaft is at the beginning of lift, all the lifter internal components are in the zero-lash position. The check ball is seated and has sealed the high pressure chamber. Starting valve lift cycle (where the camshaft pushes the lifter up), the valve spring applies force on the lifter, which slightly depresses the internal components. Then, a controlled leak-down occurs: An internal spring pushes the internal components firmly against the push rod to remove any lash in the system, after which the process starts all over again.
A hi strength, break in additive is now required for installation of new flat tappet lifters. Recent changes in engine oils have eliminated zinc and phosphorus from typical oils and this is absolutely necessary for new cam/lifter installations. We recommend a Competition Cams # 159 for this application.
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