FRANK PKNY
Well-known member
Are the full floating bearings for the rods the same from 39 trough 48?
rod bearings
- Thread starter FRANK PKNY
- Start date
Brian
Well-known member
No...the 221 and 239 engines, whilst running floaters, have different sized crankpin journals and correspondingly, different con rod dia's. The 221 series run a 1.999" dia journal, the 239 runs a 2.139" dia.
The main bearing dias of both series are the same dia, so, conceivably, one could fit either crank into either sized block
The main bearing dias of both series are the same dia, so, conceivably, one could fit either crank into either sized block
Ken/Alabama
Well-known member
Ford bearings will have a prefix of 81A for the smaller journal. The larger journal Ford bearings will have a prefix of 99A. Federal Mogul is 9800 for the small journal and 9805 for the larger journal.
Ol' Ron
Well-known member
I've used Floaters for years, early stroker and race engines. Often wondered why the Ford engineers went to the 2.139 size and not 2.140 or 2.130. Didn't make much sense.
Chevy went from 1.998 to 2.100, that doesn't make much sense either. Can't believe the .050" would add that much strength to the crank???
At least we can get 1/8 more stroke from the Ford crak.
Gramps
Chevy went from 1.998 to 2.100, that doesn't make much sense either. Can't believe the .050" would add that much strength to the crank???
At least we can get 1/8 more stroke from the Ford crak.
Gramps