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It's a 28oz balance flywheel that I'm using for my 331, but the catalogs dont list what size clutch it takes. Is it 10 1/2" clutch? That's the size I need. Anyone know? Thanks.
 

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My FMS catallog lists M-6375-A302 as a 28 oz billet flywheel intended for pre-81 engines. It also has two notes associated with that flywheel:
1. Diaphram clutch using metric bolts and dowel pins.
2. Has "bolt-on" counter weight 4" long for A302, and 7.2" long for C302.

From those notes, one has to conclude that the associated clutch/pressure plates are the 10.5" diaphram types that are typically used on the late model 5.0 Mustangs. These type of clutches/flywheels are noted as using Ford metric pressure plate bolts (N602549-S51M) and locating dowel pins (D1FZ-6397-B).
 
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