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What you need to install a HO 4.0L cylinder head on your older Jeep inline-six engine.
Parking Lot Engine Problems at 2016 Moab Easter Jeep Safari
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JEEP AMC 258/4.2L L6 1981-1985 Remanufactured Engine
Rebuilding a 4.0L Jeep Straight Six to 242HP : Engine Power
Remanufacturing A 258 AMC Cylinder Head From A 1980s Jeep
4.0 head and EFI on a 4.2 block - Jeep Strokers
4.0 head swap on 258
4.0 Head Swap EFI Wiring
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Moses Ludel's 4WD Mechanix Magazine – YJ & TJ Jeep Stroker Six
Swapping a 4.0L Into a CJ-7
Details of an Eagle 4.0 swap - Jeep Strokers
Engine I.D. Question, 4.0 or 4.2? - Full Size Jeep Network