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Old 12-18-2007, 09:29 AM
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10.5 or 11 inch clutch

I have a new 10.5" stock flywheel. What are the benefits of an 11" over a 10.5 in. clutch assembly? It sits behind a 350 w/ 430 hp. Thanks!!!!!

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Old 12-19-2007, 06:54 PM
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You can't necessarily go by clutch size when you're talking flywheels. The 10.5" clutch (actually 10-3/8") could be found on either size flywheel, depending on application.

The few 11" clutches I've dealt with were stiffer at the pedal, and require the large-diameter (14") flywheel. They will transfer more power due to the greater surface area and won't slip as much under hard use/abuse. The smaller flywheel allows a little more ground clearance, if that's an issue, and the smaller clutches are way easier on your left leg, unless you use a stiffer aftermarket pressure plate.

Chevy used the smaller clutches in standard-duty car and some standard truck applications, and also on some high-performance cars such as 302's and 427 Corvettes. Cars with the heavy-duty clutch option, such as police cars and taxis, got the 11" setup.
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