You can install a 'Mileage Camshaft' -which is the 'Torque Cam' specified in most cam manufacturerscatalogs - this will help mileage. Get the Kit and have the spring pressures dialed in. Seeing you've a Restored Original - I'll hazard the following suggestions: join strokers@xxxxxxxxxxxxxxx Obtain a 1993 AMC 4.0 cylinder head and 1988 AMC EAGLE intake manifold. {just the manifold is a great improvement} Head comes with a nice cast alloy valve cover. Use the '88 - '89 4.0 stainless exhaust header - might find a 'Borla' on eBay. 1993 4.0 cyl. head has all the Flow Bench Refinements that DCx poured cash into. Reviews by swappers are +Pos. Port floors were raised to give a straighter shot to the valves. Airflow doesn't stall as the 232/258 do. Your current cylinder head has pretty bad flow characteristics. It wasn't until the 4.0 engines that AMC did anything about creating a 'Performance' Inline 6 that got mileage. AMC choked the hell out of the 258 Pacer seeking mileage after the Rotary deal fell thru. The choked 258 killed the Pacer as they had 'problems' and zero power. EFi could be had by stripping out an '89 JEEP Cherokee harness / ECM. Use the '93 4.0 head - a '99 4.0 intake and an '88 - '89 "Renix" ECm . "Reix" is Bendix / Renault. Use a very big Transmission Oil Cooler with that lock up automatic. Look into a 'deep' sump rough cast pan for a few extra quarts of fluid. Polished alum. sheds alot less heat than does rough cast. Install a 'stud' kit for the trans. pan - allows you to change the filter without pulling out what few threads there are - and developing pesky leaks. The factory convertors had a bad habit of cracking at the 'neck' - where it goes into the pump, so keep an eye out for leaks. The late model DCx lock up convertors and aftermarket addressed this problem. |
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