| Diagram | Fig. 3 — OIL PUMP AND RELEASE VALVE; INLET MANIFOLD · ref 14 |
| Subsystem | engine bottom |
| Listed in parts books | 1960–1962, 1964–1970 |
Piston
A small piston used in the oil pump release valve assembly, later superseded by 70-8752.
GS251 is a piston as listed in the oil pump and release valve section of the parts books, not a piston for the main engine. It's the small piston used inside the oil pump release (relief) valve assembly, part of the oil feed system that also included the inlet manifold and tappet parts in some figure groupings. This is a small internal engine-bottom component, not a big-end or main piston.
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The catalog record shows this number in use across a run of appearances from 1960 through 1970, and it was later superseded by 70-8752 - if your parts book or an old rebuild kit lists 70-8752, that's the same physical piston under its later factory number.
Because the description on file is brief, we'd recommend confirming exactly which oil pump assembly you're working with before ordering, since oil pump internals changed over the years covered by this listing.
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