Block Internals

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Save time and money with Promaxx Cylinder Head with Valves, engineered as direct replacement for the CJ, Wrangler and Cherokee models. For the 4-Cylinder, 2.5L engine, this cast-iron head is shipped pre-loaded with intake and exhaust valves and hardware, so your installation time is drastically redu..

Restore horsepower, compression and fuel economy to that tired engine with one of our factory replacement heads. Matches original performance flow and is available as a complete ready-to-install unit that's fitted with valves and springs...

Restore horsepower, compression and fuel economy to that tired engine with one of our factory replacement heads. Matches original performance flow. Cast #117 & 403.Valves, valve springs and retainers are not included...

Promaxx Performance extends its reach into the Jeep market with a Stroker Crankshaft for the inline 6-cylinder 4.0 and 4.2L engines. Internally balanced and machined to factory specifications, this crank is the best bang for your buck to put extra power into your Jeep. Features 3.895 stroke and 2-pi..

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Please Note: These are sold each, so be sure to buy more than one...

For 11-23 Jeep Grand Cherokee WK2, L, and WL, Wrangler JK, Cherokee KL, and Renegade BU with 2.0L, 2.4L, or 3.6L Engines Replaces Mopar Part # 5184332AA..