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Need Help!!!Can I run a 10.5 clutch w a "621" bellhousing??I already have a new clutch set and lightweight flywheel (153) tooth...The transmission is a muncie 4 speed...many thanks
 

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I don't know which size clutch came with that bell.

However, the size of the clutch really does not matter as long as 1) it fits your flywheel, 2) it fits your transmission, and 3) there is clearance for it inside the bell.

What really matters is whether the flywheel fits the bell and whether the clutch arm parts fit both the bell and the clutch assembly.
 

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The 621 bellhousing is the one that was used in the high performance Chevy cars, like the Z28, SS Chevelle, SS Camaros and others with the 11 inch clutch. This is a sought after bellhousing to restorers and should work just fine with your clutch.
 
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