Might be too much timing when going by vacuum? Reason i bring this up is because i had mine timed with my old cam and even after installing my new cam using the vacuum gauge. I advanced it till the gauge would not show an increase in vacuum (17.5 inches of vac)then just slightly retarded it. Truck ran good at all rpms and never knocked to my knowledge but seemed to not pull that hard and would run out of power. I actually retarded the timing way down and the vac is currently 14 inches. Man what a difference in acceleration and pull. Not exactly what the timing comes out to now as i have yet to stick a light on it to confirm. Im playing with little tweaks now to see what else i can do.
I think someone mentioned that over timing just a little can hurt as bad as under timing lots.
Last edited by wolffcub; 10/27/15 06:32 PM.
52 3100,235ci,Clifford In,Fenton Ex,Fitech EFI,251/254 cam,HEI,T-5,S10 rear, and much more!
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