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I have a 97 2500 4x4 Cummins that is equipped with hydroboost and I have added several degrees of caster.The pumps as they come or with pressure regulator mods aren't adequate at idle for my liking.I read the article that member patooyee wrote and very much enjoyed his research.According to it there are longer rotor/vane cam packs with a convex rear housing cover seen without the reservoir that are .2 inch or so longer for more pump volume at idle and lower speed.Im looking to purchase one by finding out info on what application they came with.i have a bunch of pumps in great shape just need to find the right parts to make this happen and any guidance from you guys would be greatly appreciated!!
 
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