The Jeep 4.0L block ('87-'06) and AMC/Jeep 258 crankshaft ('72-'90) form the basis of a Jeep I6 stroker.

A stroker engine utilizes a different crankshaft to achieve more displacement with the same engine block. A crankshaft that has a longer stroke increases the engine's displacement while the engine itself remains unaltered from the outside.

the bottom of the block does include a very small "logo" with my company name, phone number, email address and the number of the block ex: (not actual size; it is smaller) this, i consider, to be my stamp on a hand made object, similar to what an artist would do on a piece of their art.

The answer depends on what type of use (or abuse) that the stroker engine will be subjected to. For offroading and endurance racing, the heavier 12-counterweight crankshaft ('72-'80) offers better damping against vibrations and a greater "flywheel" effect to reduce the risk of stalling in low rpm offroad use.

This will depend on the final displacement, compression ratio, camshaft, and cylinder head combination used in the stroker engine build-up. Ancillary performance modifications such as a free-flow cold air intake, bored throttle body, header, performance exhaust, larger injectors, and chip upgrade will increase engine efficiency and maximize performance. This page gives you an idea of what's possible.

There's no reason why not. A properly built and tuned stroker should run even cleaner than the 4.0 that it was based upon.

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Since you're adding displacement (~15%) to the engine, there's no such thing as a free lunch. You need more fuel to feed a bigger fire. That said, a stroker can match a 4.0L engine's fuel consumption during highway cruising but you can expect your mpg to drop 2-3% in mixed driving conditions. That's only a small price to pay considering the extra performance on hand.

The stock 5250 rpm ('91-'95) or 5300rpm ('96-'06) rev-limiter will suffice. The torque curve of most strokers will be tailing off above 4500rpm so there's little use in revving them beyond 5000rpm. Most strokers are torquers, not revvers.

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