#3920615
1968-72 Chevrolet A Body Z-Bar
The "615 " bellcrank is used on both the
Big and Small Block Chevelles produced from
1968 to 1972.
Used Original 3920615 Z Bar
Pictures and descriptions are of a used factory
original equipment equalizer shaft.
Installed View
In a car the long arm on the left is attached to the
upper clutch rod directly above the frame bracket.
The arm on the left actuates the lower push rod
which in turn pushes the clutch release fork.
Measurements
Main Pipe (overall length): 7 5/8"
Pedal Lever (pipe to tip):
Pedal Lever (pipe to center of hole): 6 1/4"
Fork Lever (pipe to tip):
Fork Lever (pipe to center of 1st hole):
Fork Lever (pipe to center of 2nd hole): 4"
Gage Hole
The gauge hole can be used for initial clutch
pedal free play by putting the push rod in it, then
adjusting the rod till the throw out bearing just
touches the pressure plate fingers, then installing
the adjustment rod in the proper (lower) hole.
Lower Push Rod Arm
This tab has a twist in it about halfway up. And
is notched so it can be welded halfway around
the pipe. The Gage hole is about 2 5/8" from the
crossshaft and the adjusting rod hole is about
3/4" farther.
Upper Clutch Rod Arm
This tab is also notched for more welding area.
The first bend is about 2 3/4" from the edge of
the pipe an the second bend is close to 1 3/4"
more.
Applications
3920615
0.852 LEVER, w/shaft
68-72 Chevelle (Chevy Parts Books)
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Application charts and part numbers are for replacement parts that were available at the time of parts book printing.
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 won’t be sorry).
This is a fun and interesting part of the hobby!
