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mtflat · 08-03-2013, 01:14 PM

Just to clarify - the flywheels (car/truck) are the same. Difference is which clutch/pressure plate size they were drilled for.

As far as I know, all trucks up thru F6 rec'd the 239 ford. Lots of farmers swapped in Mercs when the original wore out. Big trucks during this time period (49-51) were fitted with 337 Lincoln variants.

And as was said, most cast numbers on the block don't mean anything except to the caster. They are probably something like shift or batch numbers.

08-03-2013, 01:14 PM	#7
mtflat Senior Member Join Date: May 2010 Location: Kalispell Montana Posts: 344	Re: Mercury Flatheads Just to clarify - the flywheels (car/truck) are the same. Difference is which clutch/pressure plate size they were drilled for. As far as I know, all trucks up thru F6 rec'd the 239 ford. Lots of farmers swapped in Mercs when the original wore out. Big trucks during this time period (49-51) were fitted with 337 Lincoln variants. And as was said, most cast numbers on the block don't mean anything except to the caster. They are probably something like shift or batch numbers.