formula89383

i got a used holley 750 and had a carb guy rebuild it (motors i know, carbs i dont). i have no idea what its jetted to be but i want to rejet it cause it came off of a stronger 406 and it was tuned good for it. i just would like someone to give me a close guess on what jets to use on this build up 750cfm holley double pumper 2inch alum. spacer nos super power shot edelbrock rpm air gap dart iron eagle 200cc heads 10.5:compression JE forged pistons forged 383 stroker crank forged 5.7 rods comp cams 305H alum. 1.6 ratio roller rockers holley blue pump holley reg at 7psi msd 6al box accel 8.8 wires T-56 manual 2.7*? gear (borg-warner) hedman tork-step long tubes dual 2.5 inch into 3 inch cat back with 1 chamber muffler that should cover enough variables, any help on how i should set up my double pumper. jets and what not? thanks, Jon

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droppedgmc

start with 70 in the front and 74's in the rear. keep a spread of 4 when you change them. also watch your plugs, they want to be a light chocolate color

a71stangbeater

i have vortec heads on my car currently, they're 175cc heads. I have i believe a 74-76 in mine, and its been dyno tuned to a 13.1 ratio. Puttining it on a dyno with a wide band is the best way to go though. Don't go too small and drive it around though, its better to go richer than leaner

Barry85Iroc

Start with 70 (as mentioned earlier), and keep checking your plugs. Black...too rich. White....too lean. Brown.....just right.

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Carburated 5-speed (From the factory) Special ordered from A.J. Foyt Chevrolet in 1984 by me. One of 2497 made. 355, Vortec heads,512 total lift, Exner TH-350,Hughes 3000 stall, 650 Holley double-pumper ,Hi-rise intake, Global West LCA's, South Side Machine Works sub-frame kit, Headman Headers, Imco muffler, Nice stereo,exhaust cut-out, title-holder for the best-sounding exhaust 2 years running.