CNC Ported and Polished Heads are something to consider when having your engine built to spec. When you’re putting this much time and money into having a custom engine built and installed in your Jeep, you want it to perform for years to come. As such, we would recommend the CNC Ported and Polished Heads, which in turn allow for additional upgrades. These Heads feature upgraded valve springs, retainers, and locators, to support cams up to .625” of lift. The intakes and exhaust ports are smoothed using CNC methods, to ensure the cleanest mating surface for the gasket and headers or intake manifold. Specs for the Heads are as follows. The Heads themselves are CNC Ported, featuring a Single Point Cut CNC Valve Job, using a Newen EPOC CNC machine. The OEM springs are replaced with PSI 1511 Springs, the retainers and locaters are replaced with Hardened Steel versions, and the valve seals are replaced with Viton units. Again, all of these high quality parts and machining allow for the fitment of cams with up to .625” of lift, as well as increasing the velocity of air flow into the engine, due to the smoothed intake ports. If you want to get the most out of your built engine, the CNC Ported and Polished Heads are the ticket. Don’t skimp on your engine build and use the stock head or a standard aftermarket replacement. Make sure you choose this upgrade to get the most out of your investment! With new Jeeps becoming more refined and luxurious, a built engine rounds out the upgrade list, and will both increase the value and drivability of your vehicle.