Casting #3733365 55-57 Chevy Pass. & 55-59 Vette
GM Casting Number 3733365 Clutch Housing
The Chevrolet "365" is a cast iron 168 tooth
flywheel Bellhousing.It has a 4 5/8" center
hole which makes it compatible with Muncie,
saginaw, and T-10 transmissions made for GM
vehicles.This bell is listed in my parts book
as Part # 3755343 with the identification #3733365.
These covers have the starter mounted to them,
and a boss with two tapped holes for a z bar
Part Number and Date Casting
These covers had the part number cast into the
transmission mounting flange (transmission must
be removed to see the number), and an alpha numeric
date code, this example is F 9 5.
9= 9th day
The starter mount has two 3/8"-16 threaded holes
and one through hole (bottom threaded hole is broken
off on this example (common problem with cast bells).
The transmission is attached using four 1/2"-12 threaded holes.
Bottom Up View
These bells take a two piece inspection cover, one
is a belly pan that covers the bottom of the flywheel
and clutch assembly, the other goes between the
engine and flywheel.
Some versions have a thru hole at the top.
3755343 (Cast 3733365)
0.683 HOUSING, Clutch
55-57 Pass. (8cyl.) (Chevy Parts Books)
55-59 Corvette (Chevy Parts Books)
Most parts that I describe and picture, have identification on or with them, others I can identify from other sources and deduction (educated guess).
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Applications are for replacement parts that were available at the time of parts book printing, and when possible model specific assembly manuals.
My observations come from the parts I have in my collection or other reliable sources your parts may differ.
If Factory correctness is your goal, do more research, join car clubs,
forums and buy an assembly manual if one is available for your Project Car (you wont be sorry).
This is a fun and interesting part of the hobby!