Carb Adjustments? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Lizard · 08-15-2003, 10:52 PM

Can anyone tell me if there are any adjustments I might need to make to my carb after putting on Dual exhaust... The 350 ran great before doing this job, and now when the secondaries open the engine backfires and falls on its face. Any Ideas?

**COBALT** · 08-15-2003, 11:08 PM

Whenver you do anything with fuel consumption or emissions always check your ignition, your timing, and yes your fuel/air ratio. Your engine timing might be a tad retarded (opposite of advanced), which means a few extra degrees of advancement may be all you need.

Lizard · 08-16-2003, 08:19 PM

Thanks Alot, I checked the timing and it was 8 degrees retarted. I put it up to 6 BTC. It runs great. Thanks for the info..

08-15-2003, 10:52 PM	#1
Lizard Registered User Join Date: Aug 2003 Posts: 2	Carb Adjustments? Can anyone tell me if there are any adjustments I might need to make to my carb after putting on Dual exhaust... The 350 ran great before doing this job, and now when the secondaries open the engine backfires and falls on its face. Any Ideas?

08-15-2003, 11:08 PM	#2
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Whenver you do anything with fuel consumption or emissions always check your ignition, your timing, and yes your fuel/air ratio. Your engine timing might be a tad retarded (opposite of advanced), which means a few extra degrees of advancement may be all you need. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

08-16-2003, 08:19 PM	#3
Lizard Registered User Join Date: Aug 2003 Posts: 2	Thanks Alot, I checked the timing and it was 8 degrees retarted. I put it up to 6 BTC. It runs great. Thanks for the info..



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