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12-19-2010, 11:45 AM
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#1 |
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Registered User
Join Date: Feb 2010
Location: mesa az
Posts: 211
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Tach and Vacuum question
I got this setup for $20 on Thursday in eastern AZ. Guy didn't know what he had. The 16yr old and I refurbished it yesterday and installed it. I think the tach needs to be calibrated, its not off by much.How do I calibrate it? But the vacuum didn't work. Did you guys use steel lines for the vacuum gauge?
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12-19-2010, 11:47 AM
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#2 |
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Back in the sticks
Join Date: Jan 2001
Location: Fordland, MO
Posts: 3,188
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Re: Tach and Vacuum question
Not sure about the vacuum guage but on mine I used a barb and vacuum hose, I don't know what it came with originally. The tach can be zero'd using the screw on the back of it. That will bring you closer to actual.
__________________
1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty |
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12-19-2010, 11:53 AM
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#3 |
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Registered User
Join Date: Feb 2010
Location: mesa az
Posts: 211
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Re: Tach and Vacuum question
How much vacuum are you running normally? Scary thing was i got this out of a c-50. I looked at the SPID in the glove and it showed it had bucket seats. It was a 68 truck. The seats were gone wonder how cheap it could have got them. lol
Last edited by cpetersen; 12-19-2010 at 11:54 AM. |
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12-19-2010, 11:57 AM
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#4 |
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Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Tach and Vacuum question
awesome deal!
__________________
John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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12-19-2010, 12:11 PM
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#5 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: Tach and Vacuum question
I also run a barb and vac hose for mine. It's not real accurate but fun to watch. I think they are like the other gauges, close but no cigar. I'm interested in the adjustment for the tach. Mine reads about 400-600 to low. I do not remember the screw on the back. Does nayone have a picture of this? Later today I'll grab a flashlight and small mirror and see if I can find it.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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12-19-2010, 12:28 PM
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#6 |
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Registered User
Join Date: Feb 2010
Location: mesa az
Posts: 211
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Re: Tach and Vacuum question
Yeah, there is a screw hole on the back. You use a small screw Phillips. Tach does seam very accurate. Needless to say, i'm not going to trust that tach and run the motor at redline. lol
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12-19-2010, 12:32 PM
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#7 |
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Registered User
Join Date: Feb 2010
Location: mesa az
Posts: 211
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Re: Tach and Vacuum question
This truck didn't have a chevy motor in it. Alot of the farm truck C-50's came with tall block 427's. interesting thought wonder if you can stroke those motors?
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12-19-2010, 03:07 PM
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#8 | |
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Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: Tach and Vacuum question
Quote:
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68 3/4 ton  (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged  build thread41 3/4 ton (wife's)-flatbed, fully restored to original01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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12-19-2010, 05:57 PM
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#9 |
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Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: Tach and Vacuum question
I don't have a stock vac gauge, I have an aftermarket one but it has a rubber vacuum line and it works fine.
__________________
68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread41 3/4 ton (wife's)-flatbed, fully restored to original01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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12-19-2010, 06:41 PM
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#10 |
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Registered User
Join Date: Feb 2010
Location: mesa az
Posts: 211
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Re: Tach and Vacuum question
How many pounds of vacuum does it run?
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12-19-2010, 07:01 PM
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#11 |
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Registered User
Join Date: Feb 2006
Location: Smyrna, Ga
Posts: 1,647
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Re: Tach and Vacuum question
a healthy SBC should pull 17-20" of vacuum at idle. If you have a cam, your idle vacuum will be lower. the bigger the cam, the lower the idle vacuum.
The vacuum gage is a handy tuning tool. You will be able to watch when you power valve and secondaries are coming in. |
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12-19-2010, 08:46 PM
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#12 |
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Registered User
Join Date: Mar 2010
Location: Downtown
Posts: 573
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Re: Tach and Vacuum question
$20, man Ill give ya 50 for it right now...lol JK
nice find. |
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12-19-2010, 09:46 PM
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#13 | |
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Back in the sticks
Join Date: Jan 2001
Location: Fordland, MO
Posts: 3,188
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Re: Tach and Vacuum question
Quote:
__________________
1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty |
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