1938 LaSalle Production - GM Heritage Center

full compression and more efficient engine operation.
Wrist pins are first measured to one-tenth of onethousandth
variation in concentricity with a special
micrometer before being fitted to the pistons by hand.
This excellence in precision is exclusive to Cadillac.
Pistons for the more powerful Cadillac engines have
wrist pins of special strength. They are bored with
tapered ends to give increased thickness at the center
for increased strength and minimum weight.
Connecting
Rods
Connecting rods of carbon steel are strong and light
in weight. Each rod is split at an angle which permits
quick removal of the rod through the top of the cylinder
bore facilitating service work. Bearings are diamond
bored for true center accuracy.
Rifle-Drilled
Connecting
Rod
Positive wrist pin lubrication is made possible by
rifle-drilled holes in each rod from the big end bearing
directly to each wrist pin bearing.
Cylinder bores are cross lubricated. Rods of the right
hand cylinder block lubricate the left cylinder block
bores and vice versa. With each revolution of the connecting
rod oil is squirted out through a small hole in
the connecting rod's big end. Such positive lubrication
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