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Discussion Starter · #1 ·
Hey guys, this is a question abt my 91yj 4.0L, but figured is post for all to see bc its kinda, generic to engine building..... I'm rebuilding my while engine, got my new cam in yesterday and its slightly different. The lobes are all in the same place and have the same lift/duration, but every lobe is abt 3/16th of an inch more narrow than the stock cam. The new one also has a lobe for mechanical fuel pump which I don't have. Will the lobes being more narrow affect anything or is it safe to use? Tia
 
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