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Hi from australia first time on here .im Pete i own a 69 SS 454 :thumbsup: . ihave just fitted Performer RPM heads .Crower power beast 3 cam ,Rpm air gap manifold and MSD pro billet pick up dissy with blaster coil and 6A Booster ,im tryn to sort out jeting on my 750 Vac secoundry Primary is fine ,have put a meterring block in the secoundrys and have gone up several sizes now at 82 jets but still layn over about 3/700 rpm any idea how big i have to go would be appreciated as i want to sort this out a bit b4 Dyno time ,Regards Pete .
 

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Howdy Pete, Welcome to TC. Sounds like you are going in right direction on jets, the time on the dyno may serve well getting carb dialed in to your elevation etc, you may be increasing air bleeds too. I think that normally a bbc in my area begins with 80/82 in front and 88's or so in rear. Do you have a rear Pv? My first guess is a #65 Power valve , depending on your cam profile. Need to check you fuel pressure and volume too. Depending on your application, a larger carb may be in order, Can someone lend you one to try out. I hear there are some kool cars in that area.
 

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pete, jets ain't the probem , your fuel supply is not good. start at the tank and check it all out. u need a pretty big fuel flow. tell us about your tank,fuel line, pump, filter. i think you may need to go back down on the jets to get your plugs brown, if they are black you are way off. normally u never go more than 4 numbers up or down , u may have white plugs now and need more fuel, but your engine wont lay down at 3700 rpm from lean jetting. your using fuel out of the carb faster than its coming in. going to chassis dyno?
 
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