331 drag help - Ford Mustang Forum
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post #1 of 3 (permalink) Old 10-04-2012 Thread Starter
killer331's Avatar
Joined: Oct 2012
Location: el centro
Posts: 6
331 drag help

hi guys i have a 1989 mustang 331 stroker 40 over i have lots of questions...i do drag racing but my problem is i used to run fuel sistem now i am into carbs...i modifyed my car in carburetor....i have a holley 780 i dont know how to set the fuel regulator, the gap in the spark plug..im trying to run 150 shot... im running 9.1 in compression, torker 289 intake full ported,190 procomp heads, lunati cam for 331 stroker, 410 gears.. i went to track with 50 shot and i went to 7.58 sec in 1/8 mile used to do 7.68 without nitrous now im lost....hope someone can help me!
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post #2 of 3 (permalink) Old 10-05-2012
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Location: Elgin
Posts: 3,012
On fuel pressure for carb..........regulated to carb between 6 1/4 to 7 1/4 with NOS i'd say on the higher side of the window. You want a constant pressure from the pump of 15 to 18 psi to handle the demand. Speaking of.....what size fuel lines are you running. Make sure floats are set correctly.

Plug gap.......sorry, not a NOS person. IDK.

93' LX hatch, 460 w/150 plate, TH400, 9" w/ 3.60 spool. Best (so far!) of 9.40@ 146 mph with 1.40 spinning 60'
Been saying single digit coming for 3 years.....guess I finally made it!
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post #3 of 3 (permalink) Old 10-06-2012
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Location: Warren
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Run a standard copper plug gapped at .035.1-2 heat ranges colder than stock heat range when you hit it with a 150 shot.Pull 2 degrees of timing out of it for every 50Hp of nitrous. Keep the fuel pressure at no less than 7psi.
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