Engine problems -- slight backfire ... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71sub · 08-04-2003, 09:25 PM

I've got a mid-80's 350, Edelbrock Performer intake and HEI with 700r4.

Installed new Edelbrock 650cfm vacuum 2nd's and new spark plugs gapped @ .045's.

While idled @ ~ 700 RPM, no problems -- but once I put into gear, I get backfire sputers on the passenger side AND I have no
power out of engine --- used 2x the amount of gas today going to work !!!!

VERY frustrated. I've followed Edelbrock carb tuning tips
--- back out 2 full turns, turn in clockwise ( one side at a time ) till RPM drops and put back a 1/8 turn. BTW: timing's at 8 degrees.

What am I doing wrong --- what else do I need to check ?

08-04-2003, 09:25 PM	#1
71sub Registered User Join Date: May 2002 Location: Stockton, CA Posts: 169	Engine problems -- slight backfire ... I've got a mid-80's 350, Edelbrock Performer intake and HEI with 700r4. Installed new Edelbrock 650cfm vacuum 2nd's and new spark plugs gapped @ .045's. While idled @ ~ 700 RPM, no problems -- but once I put into gear, I get backfire sputers on the passenger side AND I have no power out of engine --- used 2x the amount of gas today going to work !!!! VERY frustrated. I've followed Edelbrock carb tuning tips --- back out 2 full turns, turn in clockwise ( one side at a time ) till RPM drops and put back a 1/8 turn. BTW: timing's at 8 degrees. What am I doing wrong --- what else do I need to check ? __________________ 71 C/10 : 350 / 700r4 ; Ford 9" posi 3.50 with 31x10.5 rear tires, single drive shaft, C-notch, 2.5" drop spindles, keyless entry 71 Suburban 350/350 -- caddy tail lights, keyless entry, late model seats, billet Autometer instrument cluster 70 Ford Torino -- 351W (balanced & blueprinted ), C4, VDO gauges



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