performer rpm question
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Joined: May 2010
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performer rpm question
I am workin on my 390 in a f100 4x4 it already has header and mild cam i was wondering if it worth geting the performer rpm intake to replace the cast iron 4brl intake it has now it seems to run out of breath about 3500 rpm but has good power on the bottom i am lookin to stay under 5000 rpm any suggestions thanx
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ok i was talkin to my uncle were i got the carb from it is a 1850 vacum secondary holley he jetted it down for some reason that help i would think to put bigger jets in i took out the plugs after i learned that the looked lean to me is this a good place to start
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Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
Unless you did a proper "plug chop" and then checked the plugs, all the plugs are telling you is what your idle mixture is.
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