Thread: 390 xtra HP
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06-01-2006 03:55 PM #1
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
Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance