Too Rich: SBC 670 Holley Street Avenger - The 1947 - Present Chevrolet & GMC Truck Message Board Network

c10seth · 04-30-2014, 07:06 PM

Hey, all.

I have a 360ci SBC with an Edelbrock top end kit #2022. Compression ratio is about 10:1. 93 octane fuel with Stabil left over from winter storage.

http://www.jegs.com/i/Edelbrock/350/...FcURMwod_xwA4A

I have the timing set to 12* BTDC at idle and 36* of Mechanical timing ~2,500 RPM (Vacuum advance disconnected & plugged). I installed a fresh set of spark plugs gaped to about .040" and within about 20 min of idling the truck wouldn't idle any more because the plugs were fouled out. I was getting between 5" and 10" of Hg at idle and I know it should be higher than that. A knowledgeable buddy of mine suggested it could be the Power Valve (PV) or my floats are set too high. I think my floats are ok as the the fuel level is just below the threads, from what I can see. As anyone had any issues like this? Thank you.

Kindest Regards,

c10seth

geezer#99 · 04-30-2014, 08:12 PM

Hook your vac advance up to manifold vacuum, your idle and vacuum will come up, turn down your idle and adjust your mixture screws. Presently you're likely idling on the power circuit and with a low vacuum your power valve could be opening.

67 chevelle · 04-30-2014, 08:37 PM

make sure your choke is not stuck closed

msgdsrf · 05-01-2014, 09:36 AM

Both good suggestions. Your vacuum definately should be higher with that setup, idle in gear with say around 14". What is your idle speed?

c10seth · 05-01-2014, 01:10 PM

Quote:

Originally Posted by geezer#99

Hook your vac advance up to manifold vacuum, your idle and vacuum will come up, turn down your idle and adjust your mixture screws. Presently you're likely idling on the power circuit and with a low vacuum your power valve could be opening.

I will give this a shot. Thank you much.

Quote:

Originally Posted by 67 chevelle

make sure your choke is not stuck closed

Electric choke seems to be opening and closing fine, but I'll keep a close eye on it.

Quote:

Originally Posted by msgdsrf

Both good suggestions. Your vacuum definately should be higher with that setup, idle in gear with say around 14". What is your idle speed?

idle speed was between 500 and 900rpm. I had to adjust the curb idle to keep it from stalling. I'll reconnect the vac. advance and go from there.

Thank you all,

c10seth

c10seth · 05-09-2014, 07:14 AM

Hey, all.

I reconnected the vacuum line for the dizzy advance, threw in a new set of plugs, and wow. That made a huge difference. I was getting about 20inHg and she stopped belching black smoke. I didn't realize that was that big of a deal with this Holley 670. Thank you for your help ^_^

Seth

67 chevelle · 05-09-2014, 09:47 AM

Funny it turns out to be a distributor issue , when all indications would point towards the carb

04-30-2014, 07:06 PM	#1
c10seth Registered User Join Date: Feb 2009 Location: Charlotte, NC Posts: 144	Too Rich: SBC 670 Holley Street Avenger Hey, all. I have a 360ci SBC with an Edelbrock top end kit #2022. Compression ratio is about 10:1. 93 octane fuel with Stabil left over from winter storage. http://www.jegs.com/i/Edelbrock/350/...FcURMwod_xwA4A I have the timing set to 12* BTDC at idle and 36* of Mechanical timing ~2,500 RPM (Vacuum advance disconnected & plugged). I installed a fresh set of spark plugs gaped to about .040" and within about 20 min of idling the truck wouldn't idle any more because the plugs were fouled out. I was getting between 5" and 10" of Hg at idle and I know it should be higher than that. A knowledgeable buddy of mine suggested it could be the Power Valve (PV) or my floats are set too high. I think my floats are ok as the the fuel level is just below the threads, from what I can see. As anyone had any issues like this? Thank you. Kindest Regards, c10seth

04-30-2014, 08:37 PM	#3
67 chevelle Registered User Join Date: May 2013 Location: WEST PALM FLORIDA Posts: 1,174	Re: Too Rich: SBC 670 Holley Street Avenger make sure your choke is not stuck closed __________________ 68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive

05-01-2014, 09:36 AM	#4
msgdsrf Registered User Join Date: Jul 2012 Location: White Salmon, WA Posts: 263	Re: Too Rich: SBC 670 Holley Street Avenger Both good suggestions. Your vacuum definately should be higher with that setup, idle in gear with say around 14". What is your idle speed?

05-09-2014, 07:14 AM	#6
c10seth Registered User Join Date: Feb 2009 Location: Charlotte, NC Posts: 144	Re: Too Rich: SBC 670 Holley Street Avenger Hey, all. I reconnected the vacuum line for the dizzy advance, threw in a new set of plugs, and wow. That made a huge difference. I was getting about 20inHg and she stopped belching black smoke. I didn't realize that was that big of a deal with this Holley 670. Thank you for your help ^_^ Seth

05-09-2014, 09:47 AM	#7
67 chevelle Registered User Join Date: May 2013 Location: WEST PALM FLORIDA Posts: 1,174	Re: Too Rich: SBC 670 Holley Street Avenger Funny it turns out to be a distributor issue , when all indications would point towards the carb __________________ 68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive

04-30-2014, 08:12 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,723	Re: Too Rich: SBC 670 Holley Street Avenger Hook your vac advance up to manifold vacuum, your idle and vacuum will come up, turn down your idle and adjust your mixture screws. Presently you're likely idling on the power circuit and with a low vacuum your power valve could be opening.



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