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#1 |
Registered User
Join Date: Aug 2020
Location: Asheville, NC
Posts: 9
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Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. Help
Today I was finally able to get the hood back on and get my truck out for some tests drives.
Bought the truck on a whim, then decided to paint it. That's when all budget broke loose and I accidentally bought a built motor on eBay. From there, I rebuilt the trans and rebuilt the axle while meticulously putting the whole thing back together. I'm a professional maintenance mechanic by day, so taking stuff apart and putting it back together better than it was from the factory is my strong suit. Tuning engines isn't. Now I need the kind of help that I can't find locally. Hell I'd pay a guy if I could find a guy. The major problem with the tune is that I am getting bogging and backfires through the carb under WOT. Regular driving is just fine. Off idle at a stop sign could be better. I'm trying to go slow and ask pros before I bonk something, lots of time and money invested. This is my first vintage engine tuning project and have studied YouTube and the Power Manual, but I'm out of my depth. I have not adjusted the carbs from how they came to me other than to synchronize them at idle and adjust linkage. I set the timing based on a best guess and what it seemed to like with a regular light and timing tape. The Truck: 1969 C-30, factory chassis-cab, originally NCDOT truck with flat dump installed after it was decommissioned. Engine: The motor builder is an aircraft mechanic and sent ALL receipts from when he built the motor in 1992. It was crated and never installed. He changed relevant gaskets, lump ported, and re-broke in the motor after storage. I took delivery straight from him. While this motor has been ran on a test stand and on a few short test drives, it's never been road tuned. Chevy 292 L6, .030" over with stock pistons, HMV-272 cam, lump port, twin Holley 2-barrels on a Clifford maniflold (water heated), Tube headers, GM HEI. Drivetrain:SM-465 Trans. GM 14 Bolt rear with 3.73 gears. Timing: 18° base, 12° vacuum, 36° total measured with timing tape. Some Pics Last edited by SuperNathanSunshine; 12-21-2020 at 10:15 PM. |
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#2 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,866
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
Sorry SNS, we are going to need a lot more pics of this truck from beginning till now. I love it! I cant help you with your tune, but really, more pics would be awesome.
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#3 | |
Registered User
Join Date: Aug 2020
Location: Asheville, NC
Posts: 9
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
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#4 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,866
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
Nice work! I have a 71 C30 Ive been putzing around with. Busy with a lot of other things at the moment though so it just sits in the garage.
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#5 |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,525
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
That's a pretty sharp looking C30 Dually. I see you upgraded to a 14 bolt rear diff. I'm assuming you upgraded the front to disc also? Looking Good!
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#6 |
Registered User
Join Date: Jun 2000
Location: Bismarck, ND
Posts: 4,284
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
Wow, Sweet truck. I really like the chrome wheels on a 1 tonner.
Hope you get it sorted out so you can show it off.
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Unrestored 68 C-10 CST. Original 327. 4-Speed CH465. 50k or so miles. TREASURER, Drum Brake Club. |
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#7 |
Senior Member
![]() Join Date: Feb 2009
Location: Parker, Texas
Posts: 685
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
How is your pump shot? Are you getting fuel the instance the carb is cracked open? An intake valve too tight (rocker holding valve open)?
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1970 2WD K5 1968 Camaro Conv 1967 Chevy SWB 1964 Malibu SS 1957 Corvette Pics www.picturetrail.com/wesmigletz |
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#8 |
Registered User
Join Date: Nov 2019
Location: LA - Lower Alabama
Posts: 57
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
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#9 |
Senior Member
![]() Join Date: Nov 2008
Location: Cleveland, OH
Posts: 591
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
I would recommend buying some simple tools if you don't already.
1. Adjustable timing light 2. large face vacuum gauge for diagnostic purposes Whatever it is, I am sure it simple... However simple is a relative term. You need to understand what is going on first in order to diagnose an issue. The accelerator pump is a good tip, make sure you are getting a squirt instantly. A lot of times with a bog or hesitation on WOT it turns out there is a vacuum leak somewhere. Someone left a plug off the carb or there is a problem with a carb or intale gasket.
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1972 Cheyenne Super 20 Custom Camper 12 Valve Cummins/5spd manual 1972 Cheyenne Super Short Bed 557 Med Olive DK olive 1970 K5 Blazer Dark Gold 1966 Coronet 440 35k mile survivor 1991 Suburban 2500 454/4L80E 2wd 1985 Monte Carlo SS 383 Sbc, t-56 magnum 6spd and Ford 9" |
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#10 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,265
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
Ambitious project. What carbs and what CFM are they?
I have a 292 L6 bored .030 over, Crane 260H cam, 1.84'' intake valves, HEI, Offy intake Clifford headers and an Edelbrock 1404 500 CFM cam. 292 @ .030 over = 296 CI.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 12-23-2020 at 09:01 PM. |
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#11 |
So,, what else you got???
![]() Join Date: May 2010
Location: Jackson, Mo
Posts: 18,637
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
That truck is just too cool.....
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Our paypal is specialtyretail@yahoo.com Please DO NOTsend paypal funds as a gift, right is right. Thanks.... Sorry, we CANNOT ship larger parts. Thanks.
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#12 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,487
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
Quote:
All I get when I go to that site is a black screen. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#13 |
low n' slo
![]() Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,165
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
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67 1/2 ton Suburban - Project DRGNWGN. Build thread ![]() -_--_--_ _________ _--_-_ -/____|__|__\__ ,.,,,.,.,,.,|_O _______ O_] |
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#14 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,487
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Re: Finally!!! Was able to drive it home from my shop. Still lots of tuning to do. He
Quote:
Same thing with that link. I wonder if my Malwarebytes is blocking it. Dunno' LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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