| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE; INLET MANIFOLD · ref 6 |
| Subsystem | engine bottom |
| Listed in parts books | 1960–1962, 1964–1970 |
Feed plunger
The feed-side plunger from the oil pump assembly, used across oil pump and release valve figures from 1960 to 1970.
GS153 is the feed plunger from the oil pump assembly, the part that pushes oil through the feed side of the pump body on its way into the engine. It shows up across the oil pump, release valve, and manifold figures in the parts books, so it's tied directly to the lubrication side of the bottom end rather than the scavenge side.
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This is a wear item inside a pump that sees a lot of stroke cycles over the years, and a worn or scored plunger is a common cause of low oil pressure or erratic feed on these engines. If you're rebuilding an oil pump, it's worth checking this plunger against its bore for play rather than just reusing it.
Our catalog record shows this part appearing steadily from 1960 through 1970 across a number of oil pump and manifold figure listings, so it's a long-running component in this family of pumps. If you're not sure which pump body it mates to, bring it by or call and we'll match it up before you order.
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