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© 2009 JTR Precision Engines-All Rights Reserved Designed and Maintained by Jorin Rudd |
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To Contact us: JTR Precision Engines 2920 E. Hwy 40 Craig, CO 81625 Phone: 970-620-1014 Fax: 866-296-6045 E-Mail: jorin@jtrengines.com
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Machine Shop Member #42769 |
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JTR Precision Engines 4.2L Jeep engine with a 4.0L #7120 Cylinder Head. |
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Jeep 4.2 Rods before disassembly, bead blasting, inspection, cap cutting, new ARP bolt installation and final sizing on the rod hone. |
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The seats were cut at 5 angles on the intake and 2 angles into a radius on the exhaust for higher flow and performance. The exhausts have Durabond 30000 Series hardened seats installed for long life. |
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The guides were turned down for the springs used and adjusted with shims to set the proper installed height. We installed Viton positive seals on this head and used Chevy style 1.250” High Performance valve springs. |
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Deck has been equal parallel surfaced to the crankshaft centerline and then the bores were cut and honed. |
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4.2L with 4.0L Head swap engine installed in a 1989 Jeep Wrangler. |
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Aftermarket #330 replacement 4.0L cylinder head valve seats. These seats only have the 45 degree seat angle cut into them. This is a big performance killer out of the box. |
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Another one of our custom engine packages here at JTR Precision Engines is the Jeep Straight 6 engines. Does your Wrangler, Cherokee, or other Jeep leaving you wishing for more? We can cure that for you with one of our custom engine packages. These engines are very powerful and even put many V8’s to shame! |
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Factory 4.0L valve cover that has been milled off the top and then painted and clear coated. |
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The 4.0L #7120 Head after the 1.250” SBC style springs were installed with the factory Jeep retainers to keep costs down. These heads have Viton seals. |
