Take a good look at this lead shot, then compare it with the finished engine at the end of the article. You’ll find no difference, and there lies the slick work by the magicians at JIMS. They’ve managed to stuff one hundred and six cubic inches into a stock case, using the stock bore, and we’re going to tell you how they did it!

To give you all a good look at what composes this kit JIMS R&D department laid out to the whole package for us to take a shot of.

Pay special attention to the oilers at the bottom of the picture, we’ll talk about them more later. These flywheels are completely redesigned and utilize aerospace quality 4140 forged steel. The pistons are also JIMS design and are also aerospace quality 4032 high silicon aluminum alloy. All assemblies come pre-balanced and ready for installation.

We gotta figure that if you’re gonna try this at home you already know how to get your engine out of the frame, so we’re going to focus on the bench work. We started breaking down the stock engine by pulling apart the cam case.

(You’ll find complete instructions on twin cam installation elsewhere on Bikernet’s JIMS site.) Then the cases can be split without removing the alternator.

JIMS tool number 1047TP makes this a snap.

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