I found another clover leaf symbol stamped in the block while cleaning
sludge off the engine.  This one is back bt the distributor whole on
the flat surface.  Evidently, Studebaker stamped these clover leaf
blocks all over the place.  That is the 3rd one I've found.

The number 84 is inside the clover leaf symbol.  Does anyone know what
the number means?

The cloverleaf stamp indicated heavy duty components ie these engines
were replacement heavy duty truck engines.

They were replacement engines sold by the factory. Could they be called
crate engines?

Henry

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Please explain what a "clover leaf block" is.
Joe Roberts

Now that I have the R1 engine torn down I have discovered it is a
clover leaf block.  It has a clover leaf by the JT engine # (stamped in
the correct place on the block by whoever replaced the original engine)
with the traces of a clover leaf and a number 8.  The crank has a
clearer clover leaf with the number 84 next to the number 1 on the rear
of the crank.  Anyone ever seen the clover leaf stamped on the crank
shaft?

The engine has R1 pistons with the correct R1 casting #'s.  A fiber
timing gear which I will replace with the correct aluminum one and R1
heads that are the correct casting number. I am going to use the R1
heads but with a thicker gasket to reduce the compression ratio by .50.
The rust damaged cylinder bore is not as bad as I thought.  I am going
to run a hone in it to clean it up.  The piston in the damaged cylinder
however had rings that were completly frozen (checked one other
cylinder and the piston and rings were fine) and imbedded in the ring
groves on the piston so I replaced that piston with one from my R1
Avanti piston stock.  All in all it is a fun project.