Author Topic: 1991 Crew Cab Going 6.0 LS  (Read 8527 times)

Offline ehjorten

  • Junior Member
  • ***
  • Posts: 916
Re: 1991 Crew Cab Going 6.0 LS
« Reply #60 on: September 25, 2017, 09:16:53 AM »
Replaced the pump on Friday night and all it good!  Warrantying the bad pump!
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline ehjorten

  • Junior Member
  • ***
  • Posts: 916
Re: 1991 Crew Cab Going 6.0 LS
« Reply #61 on: October 24, 2017, 09:32:15 AM »
Haven't updated in a while.  Unfortunately the progress has slowed as I work on fixing little things here and there.  Lately I have been working on replacing the cracked-up radiator support.  With that, I have been cleaning up every little thing that is mounted to the radiator support!  This is time consuming!!!

This weekend I found the correct charcoal canister bracket for my crew at the local pick-n-pull.  They had an '89 suburban there and the bracket looked correct.  My truck never had the bracket and the charcoal canister was just laying at the front of the driver's side wheelwell.  Last night I drilled and installed (3) 5/16-18 AVK inserts to mount the bracket, as my aftermarket front fenders did not have the weld-nuts to mount it, but did have one locating hole for the bracket.

« Last Edit: October 24, 2017, 09:37:59 AM by ehjorten »
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18066
    • http://www.73-87chevytrucks.com
Re: 1991 Crew Cab Going 6.0 LS
« Reply #62 on: December 04, 2017, 11:33:32 AM »
For the fuel tank lines I make them the same length as they can get kinked when looped. Neighbor tried that on his TBI truck and burnt the TBI pump up within a week (AC Delco) It makes it a pain to remove the tank, but it's not any worse than before.

As for the switch valve, it should be fine unless you run more pressure.  Most LS run around 52 at the regulator. 

Offline ehjorten

  • Junior Member
  • ***
  • Posts: 916
Re: 1991 Crew Cab Going 6.0 LS
« Reply #63 on: February 20, 2018, 09:30:04 AM »
Been a little slow and stalled-out on this while I work on little things and figure out some technical details of finishing the swap.

One of the biggest challenges has been connecting up the LS to my factory GM oil cooler, but that finally got resolved yesterday afternoon!

What do you do when your factory GM oil cooler that bolts directly to the radiator support has an odd-ball SAE o-ring fitting that there is absolutely no AN adapter for???  What I thought was a metric o-ring fitting (18mm x 1.5 tube-form o-ring fitting) turned-out to be a 3/4-18 fitting.  For those that don't know, the standard 3/4" fitting is 16 thread per inch, not 18.  GREAT!  So through much searching on the internet, I was only able to find 18mm x 1.5 to -6 AN, but I need to -8 AN.  They make these fittings for power steering boxes for -6.  I was able to find one fitting through Fastenal that was 18mm x 1.5 Inverted flare to -8 AN, but they were $20 a pop and that didn't solve my o-ring dilemma!

So...what to do?...

make a 3D model of the fitting you need, create a drawing, go buy a short section of 7/8" 6262-T6511 Aluminum Hex Bar, and bring it to your machinist friend at work!!!

Yesterday I received these fittings from him and now I have everything to finish plumbing the oil cooler to the engine!

-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline ehjorten

  • Junior Member
  • ***
  • Posts: 916
Re: 1991 Crew Cab Going 6.0 LS
« Reply #64 on: March 08, 2018, 04:19:44 PM »
So last weekend I went ahead and anodized the fittings at home! I tried coloring them black, but it didn't take so well with the RIT dye. No big deal, they are going to reside under the radiator support, but they do have a nice anodized surface, which should help protect them even more.



-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 16846
Re: 1991 Crew Cab Going 6.0 LS
« Reply #65 on: March 08, 2018, 05:54:16 PM »
Why not just eliminate the oil cooler altogether? They are prone to leaks and blowing up engines.
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

Offline ehjorten

  • Junior Member
  • ***
  • Posts: 916
Re: 1991 Crew Cab Going 6.0 LS
« Reply #66 on: March 09, 2018, 12:09:58 PM »
I had 220,000 miles on my V3500 crew cab with the 454 and factory AC Delco oil cooler.  Now I will have a 96,000 mile 2004 LS 6.0 with an Improved Racing Oil Cooler adapter with -8 AN lines to a brand new AC Delco Oil Cooler.  I'm not scared.  I just wanted to fool around with home anodizing.  I didn't have to do it.  The 6262-T6511 alloy has excellent corrosion resistance to atmospheric conditions and good corrosion resistance to sea water.  The anodizing was something that we did in college for parts we made for our FormulaSAE cars.  I just hadn't done it in years.  It was a fun experiment!
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline Captain Swampy

  • Frequent Member
  • **
  • Posts: 465
  • Wisconsin
Re: 1991 Crew Cab Going 6.0 LS
« Reply #67 on: April 10, 2018, 07:08:24 PM »
Cool swap! I can't wait to see it done.
1987  350TBI 700R4  4X4  4.56 gears  33" BFG All Terrain

Offline ehjorten

  • Junior Member
  • ***
  • Posts: 916
Re: 1991 Crew Cab Going 6.0 LS
« Reply #68 on: April 11, 2018, 08:34:49 AM »
Me either!!!  I just got back by factory Chevy front valance panel.  I got it from a junk yard, had it blasted, primed it with 2k epoxy, and took it to a local body shop to be painted to match.  Now I am swapping out by factory wiring for my Auxiliary electric fan to put it into a nicer front harness that I got off of a Suburban, but it didn't have the Aux Fan wiring.

The swap doesn't take much time, it is all the little details that are dragging!
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline ehjorten

  • Junior Member
  • ***
  • Posts: 916
Re: 1991 Crew Cab Going 6.0 LS
« Reply #69 on: April 17, 2018, 08:44:02 AM »
Got my oil cooler lines all installed with push-to-connect AN lines.  Put a new PF61 tall filter on it and filled the engine up with 6 quarts of 5W-30.  I ordered a few little terminals to redo my forward harness.  They were delayed by the storms back East and when I got them and they were not the right terminals.  Now I need to order the right Metri-pack 630 sealed terminals so that I can finish this dang forward harness and button up the front end.  Add in my son's Boy Scouts and my daughter's softball and I am making slow progress on the little details!
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline ehjorten

  • Junior Member
  • ***
  • Posts: 916
Re: 1991 Crew Cab Going 6.0 LS
« Reply #70 on: July 16, 2018, 09:07:47 AM »
Tried the 2006+ 6.0 LS Dual Fan setup from GM in my truck (TYC 622230).  Because the stock LS radiator is the same width as my 1991 with the 454 (34" wide) and with the mounting ears on the dual electric fan setup, I thought it might just work.  When I got the part, I measured the top mounting ears and compared to my stock fan shroud mounting.  To my surprise...exactly the same dimensions!  SWEET!!!  This bodes well!

Unfortunately, the LH fan interferes with the power steering lines and frame rail.  If there wasn't so much interference there, I think it would dang near fitup perfect!

Now I am back to the drawing board...going to model up a fan shroud for a high-CFM single electric fan and use it in conjunction with my stock auxiliary electric fan.
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6