Casting #3729001
Chevrolet Identification Number 3729001 Clutch Housing
Chevy Cast Iron
The "001" Chevrolet bellhousing is cast iron with
room for a 168 tooth flywheel. Most General
Motors car transmissions will fit this sturdy clutch
cover. The four (4) trans mounting holes are tap-
ped 1/2"-12.
Inside
This bell housing takes a two piece gravel guard.
This makes it easy to inspect fork alignment and
clutch adjustment.
Identification Number
The casting number is in a recess in the tranny
mounting flange. This can't be seen with the gear
box is in place.
Date Code
The date code is cast into the passenger side
between the transmission "ears". This example is
dated C 56 or March 1956.
Holes
Here you can see how the center hole, ball stud
and fork hole are aligned.
Starter Pocket
The starter is mounted to the clutch housing via
two (2) 3/8" tapped holes and one (1) untapped
thru hole.
Fork Hole & Z bar Mount
The clutch release fork hole is trapezoidal shape
with flashing present. There are two (2) 3/8"-16
tapped holes for the engine side Z-bar stud bracket.
Engine Mount
There are two (2) vertical 3/8"-16 tapped holes
for engine mounting per side.
3729001
Can not find in parts catalog.
Quick Reference
Material: Cast Iron
Size: 168 tooth flywheel
Engine Bolt Pattern: Chevy
Transmission Bolt Pattern: Most GM car (Muncie, Saginaw, Borge Warner)
Transmission to Bellhousing Threads: 1/2"-13
Center Hole Size: 4 5/8"
Fork Ball Stud Threads: 13/16"-16
Inspection Plate Bolt Threads: 1/4"-20
Face to Face Measurement: 6 5/16"
Starter Mounted: Yes
Starter Nose:
Z-bar Mount: Yes (two threaded holes for 55-57 Chevy Pass. and 55-62 Corvette)
Note: all measurements are approximate.
Disclaimer:
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!
