S&S, 84-91 Crankcase Assembly, 3-5/8" Bore. Natural For Harley Davidson

S&S Superstock™ crankcases, constructed from 356-T6 aluminum, are much stronger than OEM crankcases.
OEM crankcases can/may crack in high-performance or even stock applications, as more than a few of us found out the hard way.
These S&S Superstock™ crankcases can be used for both stock and competition replacement applications.
The substantial labor savings achieved by using S&S crankcases is important for engine manufacturers.
These crankcases come "set up" with Timken sprocket shaft main bearing races and cam needle bearings installed and pinion shaft main bearing race pressed and ground.
Additional parts supplied include Timken sprocket shaft bearings, cylinder studs, nickel-plated crankcase bolts, crankcase fittings, oil pressure sensor, timing and magnetic crankcase drain plugs, and a specially designed S&S alternator stator plug retaining screw.
Flywheel scrapers are machined to match the original 8-1/2" diameter flywheels.
S&S cases maximize crankcase oil cleaning efficiency by using a ported vent design.
S&S cases have clearance up to and including 5", no additional clearance will be required for stepped cylinders.
S&S boxes are delivered complete with assembly instructions.
Note: For 84-E85 Evo Big Twin models, you must use an L85-91 style head bolt kit.
These can be ordered separately as MCS 505266 (Gardner-Westcott) or 989599 (Colony) in standard lengths only.
Note: The HD Aluminum Oil Pump (26190-73) or the S&S Oil Pump, MCS 519923, can be used on 70-91 applications.
Note: In each and every application, the technician must be able to evaluate the suitability of the components in combination with the other engine components, prior to installation.
It is important that an experienced mechanic installs and makes any necessary adjustments.

Fits: > 84-91 Evo BT with large 3-5/8" bore