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.

Technical Specs
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.

Available Finishes
Black	Natural

Links (PDF Format)

Download Installation Instructions

Delkron Big Bore Crankcases

ITEM #	SIZE	FINISH	PRICE	QTY
D1070	4.25"	Natural	$963.83
D1072	4.25"	Black	$1,009.62



Big Bore Top End Kit	Rocker Box Kit Smoothie Style	NEW! 120" Square Block Complete

©2009 Delkron, Inc. | All rights reserved. | EVOLUTION, EVO, DYNA WIDE GLIDE, SPORTSTER, SOFTAIL, BUELL, FXST, FLH, TWIN CAM 88 and Hogs are registered trademarks of Harley-Davidson Motorcycle Co. Delkron, Inc. is not affiliated with Harley-Davidson Motorcycle Co. in any manner. Harley-Davidson Motorcycle Co. does not sponsor or endorse any of Delkron's products or services.

All Delkron products are proudly made in the U.S.A.

Delkron Manufacturing | 560 Solon Road | Bedford, Ohio 44146 | Site Map