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Daves55Sedan · 07-02-2020, 12:57 AM

Yes, the flywheels are drilled and TAPPED for the clutch housing which were available in 9-1/2" and 10" clutch sizes for the Y-block engines.
Yes, the flywheels from all the Y-blocks were interchangeable (239, 256, 272, 292, 312).
I do NOT believe the flywheels and bellhousings for the 215/223 6-cyl engines are interchangeable with the Y-blocks. If worse comes to worse, I have a 6-cyl flywheel out in the garage that I could measure the O.D. if someone else had a V8 flywheel laying around that they could measure.

07-02-2020, 12:57 AM	#5
Daves55Sedan Senior Member Join Date: May 2010 Location: Granite City, Illinois Posts: 3,008	Re: 1956 272 flywheel Yes, the flywheels are drilled and TAPPED for the clutch housing which were available in 9-1/2" and 10" clutch sizes for the Y-block engines. Yes, the flywheels from all the Y-blocks were interchangeable (239, 256, 272, 292, 312). I do NOT believe the flywheels and bellhousings for the 215/223 6-cyl engines are interchangeable with the Y-blocks. If worse comes to worse, I have a 6-cyl flywheel out in the garage that I could measure the O.D. if someone else had a V8 flywheel laying around that they could measure.