Hi, I hope u guys can help me,me problem is when i punch the gas my holley carb burps fire, the engine is newly rebuilt and i have not had a chance to take it on the road yet,
so its not broken in all the way yet,any way
here what i have in it, if this helps some,the carb i a holley 0-3310(4150) 750 CFM
also when the engine is running it has a vary rich exhaust and a little black smoke is coming from inside the valve covers, my cam shaft is the Magnum kit from Comp Cams
it has a 470" lift and a 224 degree duration,
my comresshion is 9.35:1,my intake manifold is the edelbrock peformer RPM air-gap, my cyinder herd are GM HP with 2.20/1.60 valves,i have headers and a 2'1/2 inch flow master american thumder system. i checked my vacum and it reads to 12, but it does not hold study at 12. could it be from a bad cam ?