Backfire or Afterfire ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

asolde · 03-30-2014, 02:06 PM

1969 chevy 350,overhauled quadrajet carb,new pertronix ignition system. I will get up to speed around 55mph. Then all of the sudden a loss of power and POW! I believe out the exhuast and then picks up and gose like normal. Dosen't do it all the time just when I get on the highway. Runs good at all other conditions.

I have the carb mount directly to the cast iron manifold with a stainless steel shim, then a gasket then the carb. I have a divorced choke set up. Idle is set to spec.The ignition system is a pertronix set to spec.

Any Ideas?

03-30-2014, 02:06 PM	#1
asolde Registered User Join Date: Apr 2012 Location: Henderson Nevada Posts: 804	Backfire or Afterfire ? 1969 chevy 350,overhauled quadrajet carb,new pertronix ignition system. I will get up to speed around 55mph. Then all of the sudden a loss of power and POW! I believe out the exhuast and then picks up and gose like normal. Dosen't do it all the time just when I get on the highway. Runs good at all other conditions. I have the carb mount directly to the cast iron manifold with a stainless steel shim, then a gasket then the carb. I have a divorced choke set up. Idle is set to spec.The ignition system is a pertronix set to spec. Any Ideas? __________________ 1972 cheverolet K5 CST Blazer 350/auto/AC/PS/PB/Aux Batt From Medford, Oregon



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