Products > Engine Crankcases > Big Bore
Big Bore Crankcases
Move into the Big Bore with Delkron's new Big Twin motor crankcase upgrade kit. Castings are made from A356-T6 aircraft quality aluminum, and CNC machined to precise tolerances.
NOTE: A pinion shaft of +.250 must be used on the crank assembly.
This upgrade version comes with bearings, races, and studs installed. Cases are line lapped to standard size. All crankcases come with a Manufacturer's Statement of Origin. Standard bore is 4.250, but 4.375" bore is available upon request. Bolt pattern must be provided.
Delkron Big Bore Crankcases