
The first batch of 5-1 engines and most pre 1940 3-1 engines have a 2.25" (2 ¼”) crank pin which require these special bearings.
Please check your crank pin diameter before ordering though as they are not all the same and could use the larger 2.5" bearings.
Three sizes are available, standard for a 2.25' crank pin and then in 0.010" increments for those who need to compensate for a worn crank pin after a re-grind.
Please purchase shims separately to enable you to adjust the nip/clearance which should be no more than 0.003".
We strongly advise that the bearing clearance is checked with a plastigauge kit which is available on the Plastigauge page.