My shop manual has seen fit to go into hiding.
What size are the freeze plugs on a 259 engine??
I have a 259 out of a 1960 something Stude, that has been sitting for a
It is a partial flow enginf, with the 4 bolts holding down the thermostat
I have to fabricate a engine stand so I can work on it, but in the
meantime, I can try to locate parts for it. Starting with the freeze plugs.
I also need a gasket set for the engine. Who has the best prices??
jim in Tulsa.
Freeze plugs, expansion plugs, casting plugs, or whatever you want to call them
are different for different engines. Brass plugs for the Stude V8 in 1962-64
with full flow oil filter blocks take a "cup" type plug, P/N 1550386. The
1951-61 and 1962 blocks without full flow filters take a "disc" type plug, P/N
1539038. This "disc" type plug also fits 1934-62 Commanders, Presidents, 6, 8,
and V8, and 1939-60 Champ[ion]s.
For some reason, there are different size plugs for the 1961-64 6-cylinder Champ
engines. The ones that take a l 1/2" are the same as the 1962 '64 V8's. The
other is a 1 7/8" with P/N 1550433 and is listed for 1939-64 Champs. This all
may sound confusing and, if not, we could throw in the rear plug at the back end
of the camshaft. For instance, the 1951-62 V8's use a 1 1/2 "disc@ (same as the
three on each side of the water jackets on the side of the block) and the
1962-64 also takes a l 1/2", but is a "shallow cup" and is steel instead of
The 1939-58 Champ[ion] takes a l 3/4" steel "cup" and the 1959-64 takes a
149/64" steel "shallow cup." If you're still not confused, consider the oil
gallery at the left end of the V8 block that takes a 1 1/4" plug. Again, the
1962-64 takes a "cup" and the earlier V8's take a "disc" type. Both of these are
steel. In reality, any of the brass could be steel and vice versa.- just that
the brass will last longer by resisting rust The main thing is to use the
correct "cup" or "disc" (and size, of course) for your engine. The recess is
deeper on the late models and trouble comes when you try to use the "cup" type
on the earlier models that take the "disc". The "cup" may pop out as they will
not go in as far as they do on the late models.
Thanks to TED HARBIT for this information that was found in the June 1999 issue
of the BRICKYARD BULLETIN, Dale McPhearson, editor
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