Thread: 390 xtra HP
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06-01-2006 03:55 PM #1
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390 xtra HP
Looking for some more horse. I have a 390 with stock heads performer rpm intake holley 750 doulbe pumper, holley blue fuel pump. Headmen headers, rebuilt c6 w shiftkit. 389 gears. msd box and distributor. running about 13 degrees advance and all in 26 degrees advance at around 2800 rpm. Wanting to know what size jet to go to
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