Clutch and Flywheel Size
01-14-2018, 09:30 AM
#4
Race Director
Generally all 75-81 Corvettes used the 11", 26 spline clutch. The exception is the 78-79 L-48, with the Saginaw 4 speed.
The easiest way to identify which clutch you have, is by the casting number of the bellhousing. If you have the 11" clutch, the bellhousing casting number is 3899621. The 10.5" clutch, usually used the 3858403 casting (but there's also a "421" 63 only 10.5" bellhousing, and a "383" 62-63 Nova 10.5" casting).
You also need make sure you have a Super T-10, to know that you have the 26 spline shaft.
The easiest way to identify which clutch you have, is by the casting number of the bellhousing. If you have the 11" clutch, the bellhousing casting number is 3899621. The 10.5" clutch, usually used the 3858403 casting (but there's also a "421" 63 only 10.5" bellhousing, and a "383" 62-63 Nova 10.5" casting).
You also need make sure you have a Super T-10, to know that you have the 26 spline shaft.