Just got done tuneing carb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 03-10-2004, 05:08 PM

got vac guage and tuned carb, 12 deg advance, idle about 700 holding about 21hg on guage has a slight drop of about 1/2hg every now and then should I worry about it?

Also I have my dist on ported vac and lots of people say I should run it on full vac when I do it pulls it into advance at idle is that not bad? Just dont want to kill anything and I dont know how worn dist. is will be getting a new one soon(old one is squeeking really bad).

Thanks

Deltaskier · 03-10-2004, 05:52 PM

Dist should be on ported vacuum.
Edit: Unless you have that funny looking thing that it goes into & then goes out of there to the dist. Then I'm not sure. My 70 has a little "canister" that hooks up to the carb & out of that there are two lines, one of which goes to the dist.

toytruck · 03-10-2004, 07:58 PM

Wow thats alot of vacuum. I'm used to 8-9.

76bonanza · 03-10-2004, 11:20 PM

TTT

NeCrOmAnCeR · 03-11-2004, 12:23 AM

You will start a heated debate asking ported or not-ported. The intermitent drop in vacuume could be caused by alot of things, misfires, sticking valves etc... 21 in of mercury is really good, I only get around 10. Does it seem to idle any better?

76bonanza · 03-11-2004, 01:06 AM

Smooth really smooth I only have stock cam so as I understand it normal is between 18-22.

NeCrOmAnCeR · 03-11-2004, 02:12 AM

Sounds about right.

71-longbed · 03-11-2004, 04:13 AM

Deltaskier... i have the same setup ...ece soleniod i believe is whats its called... i always wondered if i could bypass it ....anyone done this on a quad 4mv?

03-10-2004, 05:08 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Just got done tuneing carb got vac guage and tuned carb, 12 deg advance, idle about 700 holding about 21hg on guage has a slight drop of about 1/2hg every now and then should I worry about it? Also I have my dist on ported vac and lots of people say I should run it on full vac when I do it pulls it into advance at idle is that not bad? Just dont want to kill anything and I dont know how worn dist. is will be getting a new one soon(old one is squeeking really bad). Thanks __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

03-10-2004, 05:52 PM	#2
Deltaskier Registered User Join Date: Jan 2004 Location: Montgomery, TX Posts: 73	Dist should be on ported vacuum. Edit: Unless you have that funny looking thing that it goes into & then goes out of there to the dist. Then I'm not sure. My 70 has a little "canister" that hooks up to the carb & out of that there are two lines, one of which goes to the dist. Last edited by Deltaskier; 03-10-2004 at 05:55 PM.

03-10-2004, 07:58 PM	#3
toytruck 5-7 dropped 87 CC Dually Join Date: Sep 2003 Location: bay city mi Posts: 326	Wow thats alot of vacuum. I'm used to 8-9. __________________ I rather be in my 77 Sanger Picklefork Jet Hydro!

03-10-2004, 11:20 PM	#4
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	TTT __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

03-11-2004, 01:06 AM	#6
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Smooth really smooth I only have stock cam so as I understand it normal is between 18-22. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

03-11-2004, 12:23 AM	#5
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	You will start a heated debate asking ported or not-ported. The intermitent drop in vacuume could be caused by alot of things, misfires, sticking valves etc... 21 in of mercury is really good, I only get around 10. Does it seem to idle any better?

03-11-2004, 02:12 AM	#7
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	Sounds about right.

03-11-2004, 04:13 AM	#8
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	Deltaskier... i have the same setup ...ece soleniod i believe is whats its called... i always wondered if i could bypass it ....anyone done this on a quad 4mv? __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.



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