Crankshaft Front Bearing Support
RCD's Crankshaft Front Bearing Support is designed to minimize the bending stress imposed on the front end of the crankshaft when driving a blower.

The force trying to lift the front of the crankshaft can easily be as much as 3000 pounds. The distance from the centerline of the blower belt to the front main bearing is approximately 5 inches. This translates to a bending moment of 1250 foot-pounds! Consider the #1 and #2 pistons and rods are pushing down on the other side of the front main bearing and you can see that the crankshaft needs some added help in this area.

A unique feature of our crankshaft support is the hub which is machined from one piece of heat treated chrome-moly steel billet. This insures the end where the ball bearing mounts will run true with the end of the crankshaft. The hub has a wall in the center for a bolt to mount it on the crank and double .250" keyways. The front slots are used to drive another accessory like oil pumps. Also see: Crank Hubs and Degree Rings.

Front Bearing Support kits:
PN: 202200-0002 SBC Standard
PN: 202200-0004 SBC Extended
PN: 202400-0002 BBC Standard
PN: 202400-0004 BBC Extended
PN: 202600-0002 TFX w/Trigger
PN: 202600-0004 426 w/Trigger
PN: 202800-0002 392/417 Standard
PN: 203400-0002 481X Standard w/Trigger
PN: 203600-0002 Fontana Standard

Additionally, we have complete gear drives for TFX and 426 with brackets for crankshaft support built into the cover.

BBC STD front bearing support
Crank Trigger Brackets may be used on all standard crank supports.

Engine with crankshaft support attached on 427 Chevy 426 w/Trigger