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Fuel injector pump will have to be recalibrated on an injector pump stand at either dealer or certified pump shop (ansi) to larger injectors. IF this is a pre-electronic or manual Bosch type pump. The I-H navistar 466 has been in service many years and several fuel delivery configurations have been used on this engine. If it a late model computerized or ccst(computer controled step time) all that may be needed is a "rewrite". A set of instructions given the E.C.M. via a diagnostic writer. Somewhat similar to "chipping" a gasoline engine.

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Q: How do you turn up the horsepower on an international 466?
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