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Small-block Meaurements?

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Old May 2, 2012 | 09:33 PM
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Small-block Meaurements?

Hello from the 80-86 forum, where I usually hang out. Anyway, I'm looking for some measurements from a 302/351W with a true flywheel on it, not a flexplate. The measurements are to determine if a small-block input shaft for a ZF5 would resolve some of the issues when mating one of the 460 versions of the ZF with a 351M/400.

Specifically, I'm looking for:
The distance from the rear face of the flywheel to the rear face, the tranny-mounting flange, of the block
The distance from the rear of the pilot bearing to the rear face of the block.

Or, if someone has just the flywheel, I need the distance from the rear of the crank pocket to the rear face of the flywheel. IOW, the thickness of the flywheel less the depth of the crank pocket. That's because I have a 351W which I can measure and, with your dimensions, figure it all out. Oh yes, I'd like the dimensions on the pilot bearing as well.

Thanks in advance!
 
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Old May 4, 2012 | 05:39 AM
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I don't have the measurements, but I do know the 460 ZF input doesn't work for a small block.
 
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Old May 4, 2012 | 07:22 AM
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Originally Posted by baddad457
I don't have the measurements, but I do know the 460 ZF input doesn't work for a small block.
No, the 460 input shaft is much too large for the small-blocks. But, that was never being considered. What is being considered is putting a small-block input shaft in a big-block ZF to gain spline engagement with the clutch, and pilot bearing engagement as well, when used with a 351M/400.

The problem is that the 460's flywheel is both larger and sits further aft than an M-block's flywheel. So the input shaft is too short to give good spline engagement and there is essentially no pilot bearing engagement. But the parts list shows a longer shaft, presumably for the small-block. The question is what using it would do.
 
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