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#1 |
Senior Member
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Location: Western Colorado
Posts: 1,165
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Re: 1968 GMC - Ol' Blue
No problem man, glad you're enjoying!
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#2 |
chevy truck fan
Join Date: Mar 2005
Location: Gilbert, arizona 85298
Posts: 1,989
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Re: 1968 GMC - Ol' Blue
Mdpotter,
Thanks for the info. I did have Brendan reflash my ecm. I will look again at his site (LT1Swap) ... I get focused on one info point and forget to look other places.... LOL ... thank you again |
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#3 |
Senior Member
![]() Join Date: Aug 2018
Location: Western Colorado
Posts: 1,165
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Re: 1968 GMC - Ol' Blue
I did it - I bought HPTuners. I'm now entering a whole new level of technology. I've always hid this misconception that tuning is hard to learn and get into, but it's not that expensive and I'm slowly learning thanks to gregski's post in the LSX thread. I plugged it into my daily last night to play with but I'll hook up to my 68 tomorrow to see how it's running and how the mail order tune is working.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#4 |
Almost Satisfied
![]() Join Date: Mar 2002
Location: Springfield, MO
Posts: 2,932
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Re: 1968 GMC - Ol' Blue
I've paid a shop a pretty good sum and mine still isn't even close. I'm about to try it myself. Let me know what you think. My truck will idle great, but if you try to give it gas it loads up and dies. Way too rich. I'm not sure I can even drive it up on a trailer at this point.
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far." |
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#5 | |
Senior Member
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Location: Western Colorado
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Re: 1968 GMC - Ol' Blue
Quote:
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#6 |
Senior Member
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Location: Western Colorado
Posts: 1,165
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Re: 1968 GMC - Ol' Blue
Again, spent half the day just mocking up and getting the bed skirts fitted. The passenger side was way off and I ended up cutting it in two and redrilling both holes where it mounts to the bed sill. Also had to rebend in a few spots. The driver side was much better, but still had to cut it in two and weld back together.
Then we routed the exhaust back from the mufflers to the back corners of the bed. I still need to put a hanger on it, but I plan on attaching to the frame and it's a lot easier to do that with the bed off and we ran out of time for that. I had no idea how much quieter it would be with the tailpipes ran, it's almost too quiet. These mufflers are advertised as the 2nd most quiet mufflers Black Widow makes and after installing them last fall I was surprised at how loud they were. But now with the tailpipes ran they're about half as loud. You can actually be cruising and talk to eachother, but when you step on it it's got a good sound. Let me tell you, having a lift is pretty nice. My dad has wanted one for a long time and we're loving it. Also hooked up my HPTuners and logged some data. From my very limited knowledge of tuning, it appears to be running pretty well.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#7 |
Registered User
Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: 1968 GMC - Ol' Blue
Man, how nice would that be, a lift
![]() Looking good under there!
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() |
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#8 |
Registered User
Join Date: Nov 2012
Location: 9
Posts: 862
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Re: 1968 GMC - Ol' Blue
Good work on the inner skirts. For whatever reason that was one thing that drove me nuts on mine.
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#9 |
Senior Member
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Location: Western Colorado
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Re: 1968 GMC - Ol' Blue
Not a big update this weekend - only had a morning to work on it. The exhaust is finished, except for tips. I fabbed up a bracket to hang it from the frame over the axle. We also replaced the fuel lines. I am convinced that the Russell rubber hose emitted fuel vapors because I would get whiffs of it while working underneath it. I replaced it with Earl's Vapor Guard hose but won't know for sure if it's better until I park it in my 2-car garage.
I can't seem to take a picture that accurately depicts just how vivid this color is.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#10 |
Registered User
Join Date: Apr 2014
Location: Azle,Texas
Posts: 2,248
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Re: 1968 GMC - Ol' Blue
If its more vivid in person it would be hard to see anything else. My eyes lock on to the brightness of the blue, dare I say it almost has a neon affect.
![]() I am using the Russell fuel line and push to connect fittings. What kind of fittings do you have? Is the Earls vapor guard hose any easier to install than the Russel? It gave me fits getting the hose to seat on the PTC fittings! I may need to change over also if I smell gas in the future.
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Brian 1972 C10, "Loyd", LWB to SWB, 5.3, L83/6L80e, 4:11 Tru Trac, Air Ride, VA, DD, 20" Coys, 4 wheel disc, A quick LS swap turned into a 6 year frame off resto-mod. Last edited by cornerstone; 04-06-2020 at 09:57 AM. Reason: added question |
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#11 | |
Senior Member
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Location: Western Colorado
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Re: 1968 GMC - Ol' Blue
Quote:
Mine were probably the same as yours, Push Lok. The fittings had three barbs and I had to heat the hose and oil the fitting to get the hose on. The Earl's fittings are much easier to put together, just put a little oil on the fitting, slide the hose on, and clamp it. No leaks so far. Vapors wouldn't be an issue if my truck weren't going to sit in my 2-car garage. It's been in my dad's shop which is much larger and isn't connected to the house. I never smell it there unless I'm under the truck pretty close to the fuel line. But he has the same hose on his 64 and I parked it in my garage one night and it stunk up the garage and crept into the house.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#12 |
Registered User
Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: 1968 GMC - Ol' Blue
Love that color man. Looks fantastic. And that is an interesting path to route your tailpipes
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() |
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#13 |
Senior Member
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Location: Western Colorado
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Re: 1968 GMC - Ol' Blue
Thanks! The leaves weren't the issue, there just wasn't much room over the axle. I had the axle to frame brake line, fuel lines, and the tank to work around I didn't want to have wrap the exhaust to make it work or do any crazy bends.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#14 |
Registered User
Join Date: Apr 2014
Location: Azle,Texas
Posts: 2,248
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Re: 1968 GMC - Ol' Blue
I went with all the crazy bends and it is tight for sure. If I ever need to do it over or it rubs/ burns anything, I'm gonna do it like yours. I've seen many that way. Very clean.
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Brian 1972 C10, "Loyd", LWB to SWB, 5.3, L83/6L80e, 4:11 Tru Trac, Air Ride, VA, DD, 20" Coys, 4 wheel disc, A quick LS swap turned into a 6 year frame off resto-mod. |
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#15 |
Registered User
Join Date: Nov 2012
Location: 9
Posts: 862
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Re: 1968 GMC - Ol' Blue
Looking good.
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#16 |
Senior Member
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Location: Western Colorado
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Re: 1968 GMC - Ol' Blue
Hope everyone had a great Easter!
So I knew the fans that came on my radiator were cheap and destined to be replaced soon so I went ahead and did it. I bought this radiator and fans on eBay and the fans were advertised as 1,228 CFM each. Through some research, I found them on Amazon for $20 a piece from a company called UPGR8. I compared them to a Spal fan rated at 1,200 CFM and noticed that the Spal fan pulls double the wattage and that confirmed for me that they are falsely advertised. Interesting that the eBay seller has since revised the details in the item listing to not indicate any fan CFM. So anyway, I bought these Spal fans rated at 1,451 CFM each. Wired them up, worked as they should and definitely moved a lot more air. It took several minutes at 3,000 RPM to get the engine up to high temp for both to kick to full speed. I noticed that running them full speed that the volt meter would drop by about 1 volt (down from 14) and the fans would slow a little bit for a couple seconds, then return to normal. This happened every 10 seconds or so. I'm not sure what's that about, but later that day I stumbled on some info on the internet saying that Spal fans are not supposed to be ran at half speed/half voltage. I wanted to hear it from Spal so I called this morning and sure enough, the tech rep indicated that it would "prematurely" wear out the motors running them in series. So I guess I'll be rewiring my fans so that one fan is on full speed when the engine reaches low temp and then the second fan kicks on at high temp (also A/C high pressure). This is the case for Spal fans, but I don't know about other manuf's. I just assumed that this would be okay since GM does it, but the fans GM uses must be designed for it. So we enlarged the holes in the shroud and I was happy with the fit and quality of these fans. Also replaced the front shocks due to the increased drop from where I had it originally. I'm getting dangerously close to starting the bodywork/paint process on my bed. We got the fuel filler door mocked up. I'm not 100% happy with the door, I didn't realize that the holes drilled in it end up inside the hole you cut in the bed. I think the door is meant to be installed in wood where you can router out a recess like for the Boyd fillers. So we had to fab up some spacers and a backing plate to attach underneath. I get tunnel-visioned and forget to take pictures sometimes, so I'll take more when I install the door. I might end up putting on the poke-through filler cap so I don't have to unscrew the cap every time. Finished the day out scuffing the underside of the floor so I can epoxy the bottom side next weekend and then Raptor line the top side in two weeks.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#17 | |
Registered User
Join Date: Dec 2013
Location: Farmington NM
Posts: 655
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Re: 1968 GMC - Ol' Blue
Quote:
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Former Build (68 c10 swb): http://67-72chevytrucks.com/vboard/s...d.php?t=724379 (SOLD) Current Built (68 c10 swb): http://67-72chevytrucks.com/vboard/s...d.php?t=787712 |
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#18 | |
Registered User
Join Date: Jun 2018
Location: Texas
Posts: 1,353
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Re: 1968 GMC - Ol' Blue
Quote:
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TA_C10 Stage 1 build - http://67-72chevytrucks.com/vboard/s....php?p=8333444 "It's only money". ![]() |
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#19 |
Senior Member
![]() Join Date: Aug 2018
Location: Western Colorado
Posts: 1,165
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Re: 1968 GMC - Ol' Blue
Fans are rewired. Here's the sequence of operations: when coolant temp reaches 195, fan #1 comes on full speed. When coolant temp reaches 205, fan #2 comes on full speed. When A/C line pressure reaches 254 psi, trinary switch closes and sends ground to fan #2. I did this because I found out my Spal fans are not 2-speed fans and running them in series at 6V instead of 12V will wear them out. This is actually a much simpler wiring schematic so I didn't mind. The resistor and diode are important because the PCM will see a ground through the trinary switch without those components and throw a code. The direction of the diode (basically a check valve) is important too. We put it in backwards the first time and the electricity could not flow through the diode. For the ignition source, I used the electric fan wire from the American Autowire harness. I posted a link to the diagram below for anyone that would like it.
Speartech Fan Relay Wiring W TRINARY SWITCH.pdf
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#20 |
Senior Member
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Location: Western Colorado
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Re: 1968 GMC - Ol' Blue
Also was able to spray the underside of the bed floor, tubs, tailgate handle, and skirts with epoxy. I sprayed three coats of SPI epoxy and this will be the final coating for these parts. Next weekend I'll shoot Raptor Liner to the topside of the floor.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#21 |
Registered User
Join Date: Nov 2012
Location: 9
Posts: 862
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Re: 1968 GMC - Ol' Blue
That is good info on the Spal fans. I had kind of wanted to rewire mine to a half speed setup, guess that's one project off the list.
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#22 |
Senior Member
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Location: Western Colorado
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Re: 1968 GMC - Ol' Blue
Yeah, I'm glad I stumbled on that info and verified. I guess it depends on the manuf whether they are 2 speed or not.
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#23 |
Registered User
Join Date: May 2018
Location: Smithers, BC
Posts: 8
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Re: 1968 GMC - Ol' Blue
Holy Crap! You did an incredible job! I wish I had 1/10th the patience you have to do the body work. What a beautiful truck!!!!
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#24 |
Senior Member
![]() Join Date: Aug 2018
Location: Western Colorado
Posts: 1,165
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Re: 1968 GMC - Ol' Blue
Thanks! I'm jealous of your coil rear end and wheels. Leaf springs suck!
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1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632 1968 GMC C15 - Gen III 6.0 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=772047 1969 Chevy C10 - Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=809184 1978 Chevy Scottsdale K20 1993 Chevy C1500 - 5.3/T56 swapped 2008 Silverado Duramax |
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#25 |
Registered User
Join Date: Sep 2013
Location: Brighton Colorado
Posts: 20
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Re: 1968 GMC - Ol' Blue
MDpotter was there much effort need to get those headlight to fit? Did you upgrade the harness? thanks
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