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Old 03-23-2020, 02:32 PM   #251
Jason Banks
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Re: 1968 GMC - Ol' Blue

I guess I got lucky with the bumper bracket holes on my coil spring rear end 1968, cut the 8 inches off the back. There were already 2 sets of holes on the sides of the frame, ones at the back and another set 8 inches forward. So, when the 8 inches was gone they holes were still there. Had to drill the top of the frame though.
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Old 03-23-2020, 02:54 PM   #252
MDPotter
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Re: 1968 GMC - Ol' Blue

Quote:
Originally Posted by Jason Banks View Post
I guess I got lucky with the bumper bracket holes on my coil spring rear end 1968, cut the 8 inches off the back. There were already 2 sets of holes on the sides of the frame, ones at the back and another set 8 inches forward. So, when the 8 inches was gone they holes were still there. Had to drill the top of the frame though.
I've come to realize just how much better coil spring trucks are vs leafs. For the reason you mentioned as well as a few others.
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Old 03-23-2020, 03:08 PM   #253
1971Stepside
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Re: 1968 GMC - Ol' Blue

Quote:
Either way, you're on the right path with the Boyd tank. I wish I would have spent more money and bought it. If you weld the mounting strips to the frame then it makes tank removal/reinstall a breeze if you have enough slack in your fuel lines and wiring.
I think I can remove the last cross member behind the tank and get to all of the bolt heads if worse comes to worse. Then reinstall the cross member.
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3000 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. Other toys always push it aside, but one day....one fine day, she will be back on the road.

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Old 03-25-2020, 07:32 PM   #254
rodstored-72
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Re: 1968 GMC - Ol' Blue

Md potter,
thank you for the PM replies, I hope I didn't hijack your thread. As always enjoy the updates from you..
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Old 03-26-2020, 09:05 AM   #255
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Re: 1968 GMC - Ol' Blue

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Originally Posted by rodstored-72 View Post
Md potter,
thank you for the PM replies, I hope I didn't hijack your thread. As always enjoy the updates from you..
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
2016 Sierra 1500 All Terrain SLT - 33's, leveling kit, muffler delete
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Old 03-26-2020, 01:06 PM   #256
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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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Old 03-27-2020, 09:41 AM   #257
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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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1968 GMC C15 - Gen III 6.0 Restomod in progress http://67-72chevytrucks.com/vboard/s...d.php?t=772047
1969 Chevy C10 - upcoming build
1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632
2016 Sierra 1500 All Terrain SLT - 33's, leveling kit, muffler delete
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Old 03-27-2020, 10:49 AM   #258
1971Stepside
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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/3000 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. Other toys always push it aside, but one day....one fine day, she will be back on the road.

www.paypal.me/Cape505

"I can't complain, but sometimes I still do. Life's been good to me so far."
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Old 03-27-2020, 11:07 AM   #259
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Re: 1968 GMC - Ol' Blue

Quote:
Originally Posted by 1971Stepside View Post
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.
Mine runs great (it starts, idles, runs down the road) but I have no idea if it's running lean or rich. I'll plug it in tomorrow and see where I'm at and then start making adjustments. Gregski's tutorial doesn't address tuning for a cam swap and I'm not sure if he's planning on it or not. The only reason I got a mail order tune is because of the cam swap, otherwise the basic swap changes would have been fine (delete VATS, rear O2's, cats, etc.). At this point I'm considering the mail order tune a base tune and as long as there's nothing catastrophic that leads me to put a stock tune back in and start over, I'll use it as a starting point.
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1968 GMC C15 - Gen III 6.0 Restomod in progress http://67-72chevytrucks.com/vboard/s...d.php?t=772047
1969 Chevy C10 - upcoming build
1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632
2016 Sierra 1500 All Terrain SLT - 33's, leveling kit, muffler delete
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Old 03-30-2020, 09:28 AM   #260
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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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1968 GMC C15 - Gen III 6.0 Restomod in progress http://67-72chevytrucks.com/vboard/s...d.php?t=772047
1969 Chevy C10 - upcoming build
1964 Chevy C10 - Gen IV 5.3 Restomod http://67-72chevytrucks.com/vboard/s...d.php?t=768632
2016 Sierra 1500 All Terrain SLT - 33's, leveling kit, muffler delete
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Old 03-30-2020, 10:39 AM   #261
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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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Old 03-31-2020, 12:55 PM   #262
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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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