need help with BBC - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sinister72 · 06-11-2006, 10:32 PM

I have my fresh 402 in finally.Its a .030 over 402 10:1 hyper. pistons , voodoo cam(272),performer manifold, new Holley 3310 750 cfm carb,new dizzy,wires ,etc,etc. having problem getting it to idle?? Have checked for vacumn leaks ,seems ok, starts right away ,but have to keep the gas to it to get it to idle . throttle runs up without stumble ,but comes down then stumbles and wants to die. Have adjusted curb idle up and down and will run at about 1200 rpms. Timing is set at 12 degrees. any lower and it wants to backfire back through carb. Any ideas??

06-11-2006, 10:32 PM	#1
sinister72 Registered User Join Date: Apr 2002 Location: Bowling Green, kentucky Posts: 182	need help with BBC I have my fresh 402 in finally.Its a .030 over 402 10:1 hyper. pistons , voodoo cam(272),performer manifold, new Holley 3310 750 cfm carb,new dizzy,wires ,etc,etc. having problem getting it to idle?? Have checked for vacumn leaks ,seems ok, starts right away ,but have to keep the gas to it to get it to idle . throttle runs up without stumble ,but comes down then stumbles and wants to die. Have adjusted curb idle up and down and will run at about 1200 rpms. Timing is set at 12 degrees. any lower and it wants to backfire back through carb. Any ideas?? __________________ 72 chevy C-10 swb fleetside,402 BB.700r4,buckets,console.etc. 72 Blazer CST 350,AT, new project 1971 Chevy Nova ,355 SB blow through turbo in works.



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