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Chevy Clutch Housings

Most people define Chevrolet Bellhousings by the Clutch size (i.e. 10.5",11", or 12"). Flywheel Diameter (12.75" or 14") or number of teeth is more accurate because some 168 tooth flywheels are drilled with multiple bolt patterns, and the aftermarket makes a 153 tooth flywheel that a 11" clutch and pressure plate will fit.

Chevrolet has always had just two sizes of flywheel: Big (168 tooth 14" diameter) and Small (153 tooth 12.75" diameter), with the 153 tooth flywheel being introduced in 1963.

The early bells were cast iron with the aluminum bells being phased in. Eventually aluminum became the only material for all factory bells.

With that said, most Chevy bells will physically fit Small Blocks from 1955 on up, 6 cylinders from 1963 on, and all Big Block engines, W engines, as long as they are Chevrolet engines. GM used engines from other divisions in Chevy cars.

But, there are major differences to consider such as transmission mounting hole size, clutch fork ball stud locations, z-bar mounting provisions, starter, clutch fork hole location and, of course, factory correct application.

168 tooth
153 tooth

In the above photo you can see the difference between the starter sides of the two aluminum housings. On the 168 tooth bell, the starter is farther away from the crank center line and therefore needs more room in the bell.

Paint: Most Chevy bellhousings I've come across were panted while attached to the engine and transmission, and have over-spray in various places on the inside (starter hole, fork hole) with the outline of trans mounting ears on the front. This isn't heavy, just over spray.

Inspection covers: I've found three different sizes for aluminum bells. 153 tooth, 168 tooth and truck. But, there are variations in the starter hole.

Date codes: Most cast iron bells have an alpha numeric code. Aluminum bells? I saw discussion on a forum that the single number over the part # was a date code, which I doubt. Manufacturers usually put a number in molds and dies to help with quality control(as in number seven cavity needs maintenance).There are one or two circles divided in half that are Engineering codes and may contain some sort of date code. I have seen a few bellhousings with 80 in the circle; these are obviously date codes. Some bells have a graph-looking thing with dotes also. I will try to research these.

For pictures,applications and more details click on the Picture or part number link.


Sub-Categories
462606
462606
153 Tooth Chevy (2 types)
464697
464697
168 Tooth Chevy (2 types)
3704922
3704922
168 Tooth Chevy
3731567
55-56 Vette
3729001
3729001
Chevy 168 Tooth
3733365
3733365
168 Tooth Chevy
3742027
57 Chevy
3742257
3742257
58-60 Chevy Pass.
3764591
3764591
1st Aluminum Chevy Bell
3779552
60-62 Chevy Pass.
3779553
3779553
60-64 Chevy Pass., 60-63 Vette
3788383
3788383
153 Tooth Chevy II (small hole)
3788421
3788421
153 Tooth Chevy (Small Hole)
3840383
3840383
153 Tooth Chevy
3843942
3843942
3849309
3849309
153 Tooth Chevy II
3858403
3858403
153 Tooth Chevy
3872444
3872444
168 Tooth Chevy
3899621
3899621
168 Tooth Chevy
6270026
6270026
73-76 4 cylinder
14048867
14048867
84-85 Corvette
14060627
14060627
1983 F Body
14075723
14075723
1984-89 F Body
 
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