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Difference O-320 vs O-360

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wally

Well-Known Member
Joined
Mar 31, 2004
Messages
932
Location
southwest TN.
I found this from another group and thought I would share it. Someone posted here and wanted to identify an old airboat engine. Maybe this will help.

Also found out all the 4 cylinder Lycs use the same camshaft.

I just placed an O-320 and O-360 (standard deck
parallel valve) cylinder together. The cylinders are
identical in height as regards the cylinder head. They
differ in the length of the steel barrel. From the
underside of the lowest cylinder head fin to the
bottom edge of the cylinder spigot (area beneath the
cylinder to case mounting flange) is:

O-320 = 5 5/16"
O-360 = 5 15/16"

Measured from the lower side of the bottom cylinder
head fin to the cylinder to crankcase mating surface
is:

O-320 = 4 3/8"
O-360 = 5 1/16"

A measurement to the "top" of the cylinder to
crankcase mating flange may not be accurate, as the
thickness of this flange varies.

An easier way may be to count the number of fins on
the steel cylinder. Mine rate as follows:

O-320 = 15 fins
O-360 = 20 fins

Hope this helps.
 
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