What have you done to your square lately??

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
868
Reaction score
1,728
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Man, I've got to paint the rust behind her grill. Too obsessive not too. I have to work around the driver though. She said she has to take it to do farm chores later.
Got to do it right.
 

Attachments

  • 20260808_101057.jpg
    20260808_101057.jpg
    187.2 KB · Views: 13

86k20-ds

Junior Member
Joined
May 30, 2026
Posts
16
Reaction score
61
Location
arizona
First Name
geoff
Truck Year
1986
Truck Model
K20 Custom Deluxe
Engine Size
5.7 Liter 350
That’s it. I need new tails. You’ve convinced me. Looks great
Thanks! the ones from summit are amazing but if you do get a pair make sure you get the united pacific gaskets they have because the included ones suck. Good luck on your truck!
 

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
868
Reaction score
1,728
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Rust reformer applied where needed. I will throw on some satin black caliper paint after wipe down. Quick easy.
Also thought aux fan blade from Australia cool. Motor Japan.
 

Attachments

  • 20260809_111846.jpg
    20260809_111846.jpg
    305.7 KB · Views: 9
  • 20260809_111934.jpg
    20260809_111934.jpg
    102 KB · Views: 8
  • 20260809_102959.jpg
    20260809_102959.jpg
    94.3 KB · Views: 8

Gander

Full Access Member
Army
Joined
Aug 27, 2025
Posts
184
Reaction score
210
Location
Dirty Bay, TX
First Name
Lawrence
Truck Year
1987
Truck Model
V10
Engine Size
350 TBI
over the past few weeks I’ve been gathering the 3 different types of clips and all the missing bracketry to run my spark plug wires the factory way and not have to use zipties or whatever. I have a 1987 5.7 so first year TBI. The brackets on the rears of the heads were there and the little tab on the oil dipstick bracket but that was it.

One thing I did last month or at least thought I got done, was cleaning and checking all the grounds on my truck. The last one was the ground strap from the firewall to the rear of the passenger cylinder head. Had to get under the truck and fish my hand up there to get it off but got it. I was sure that was the only ground that connected there, all the stuff I saw online said it was. I saw a couple posts about later TBI trucks saying there were a couple wires that were supposed to be grounded there with a ring terminal but those were later trucks and all the stuff I saw folks were sure about just that ground strap. Anyway, while I was fishing my spark plug wires around those back brackets and getting them in the clips I felt something slip over my pinky finger. I tugged it out and it was a ring terminal with a couple of really crusty wires with the insulation crumbling off. I cut the tape and conduit on the main harness enough to get them out. Pulled out the wiring diagram and sure enough, they’re ECM grounds. Soldered them together and to a 14 gauge wire, ended that with a ring terminal, and then it was back under the truck to get the bolt off the passenger head back off to slip the ring terminal on and then bolt the whole thing back up. I also taped up a couple wires I saw that could use it and then put everything up in little plastic conduit and taped that and then ziptied everything together and up out of the way. Alls well that ends well.
 

WFarm

Full Access Member
Joined
Jan 11, 2023
Posts
1,268
Reaction score
8,102
Location
Central Virginia
First Name
Paul
Truck Year
1975
Truck Model
K5 Blazer
Engine Size
454
Today I dialed the timing back in and adjusted the idle mixture. I had marked the distributor when I removed it a couple months ago and dropped it back in lining up to those same marks, but as it turned out it was several degrees retarded nonetheless. Adjusted it to 12 degrees advance.

One noticeable change was carburetor temperature when the engine is hot. I blocked off the heat crossovers (Fel-Pro 1210 gaskets had metal plates for that) and when I checked the carb after it had been shutdown for 10-15 minutes it was far from hot. Noticeable change from before with the heat crossovers in play.

Used my vacuum gauge to adjust idle mixture. Didn’t need any significant changes.

After days of storms tomorrow is forecast to be hot and dry. Roadtrip!

You must be registered for see images attach
 

Radiohead

That guy on the Columbia
Joined
Mar 17, 2022
Posts
3,259
Reaction score
10,511
Location
Low Earth Orbit where it's safer
First Name
Eric
Truck Year
MCMLXXIX
Truck Model
C-20 Silverado Camper Special
Engine Size
454 crazy cubes, or 7.4 luscious litres
Memory burst! I had a timing light just like that since the early 80's until I loaned it out around covid and the loanee proceeded to destroy it in a fan blade, IIRC.

Cool!
 

WFarm

Full Access Member
Joined
Jan 11, 2023
Posts
1,268
Reaction score
8,102
Location
Central Virginia
First Name
Paul
Truck Year
1975
Truck Model
K5 Blazer
Engine Size
454
Memory burst! I had a timing light just like that since the early 80's until I loaned it out around covid and the loanee proceeded to destroy it in a fan blade, IIRC.

Cool!
I’ve lost count of how old that light is. Actually have two of them as I got my dads when he passed.
 

Tank6x2

You’re Awesome Know That!
Lifetime Supporting Member
Joined
Mar 27, 2017
Posts
1,293
Reaction score
2,019
Location
Edmonton Alberta Canada
First Name
Kurt
Truck Year
79/86
Truck Model
C30
Engine Size
350, TH400.4:10 gears 2WD
Over two weeks I’ve ordered 2 rads both bent vertically - thanks Bezos workers for doing right! lol see what the third turns into
 

Attachments

  • IMG_1064.jpeg
    IMG_1064.jpeg
    113.2 KB · Views: 11
  • IMG_1065.jpeg
    IMG_1065.jpeg
    114.4 KB · Views: 11
  • IMG_1060.jpeg
    IMG_1060.jpeg
    140 KB · Views: 10
  • IMG_1032.jpeg
    IMG_1032.jpeg
    242.2 KB · Views: 10
  • IMG_1033.jpeg
    IMG_1033.jpeg
    103.5 KB · Views: 10

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
868
Reaction score
1,728
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
over the past few weeks I’ve been gathering the 3 different types of clips and all the missing bracketry to run my spark plug wires the factory way and not have to use zipties or whatever. I have a 1987 5.7 so first year TBI. The brackets on the rears of the heads were there and the little tab on the oil dipstick bracket but that was it.

One thing I did last month or at least thought I got done, was cleaning and checking all the grounds on my truck. The last one was the ground strap from the firewall to the rear of the passenger cylinder head. Had to get under the truck and fish my hand up there to get it off but got it. I was sure that was the only ground that connected there, all the stuff I saw online said it was. I saw a couple posts about later TBI trucks saying there were a couple wires that were supposed to be grounded there with a ring terminal but those were later trucks and all the stuff I saw folks were sure about just that ground strap. Anyway, while I was fishing my spark plug wires around those back brackets and getting them in the clips I felt something slip over my pinky finger. I tugged it out and it was a ring terminal with a couple of really crusty wires with the insulation crumbling off. I cut the tape and conduit on the main harness enough to get them out. Pulled out the wiring diagram and sure enough, they’re ECM grounds. Soldered them together and to a 14 gauge wire, ended that with a ring terminal, and then it was back under the truck to get the bolt off the passenger head back off to slip the ring terminal on and then bolt the whole thing back up. I also taped up a couple wires I saw that could use it and then put everything up in little plastic conduit and taped that and then ziptied everything together and up out of the way. Alls well that ends well.
Awesome, please advise where you found the plastic clips that go on the brackets! We have the brackets (87 tbi, 454).
I was following your read thinking, wait there's a couple more wires...good job.
 

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
868
Reaction score
1,728
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Memory burst! I had a timing light just like that since the early 80's until I loaned it out around covid and the loanee proceeded to destroy it in a fan blade, IIRC.

Cool!
My Dad had one. I wonder if it's in a drawer, lol?
 

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
868
Reaction score
1,728
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
Over two weeks I’ve ordered 2 rads both bent vertically - thanks Bezos workers for doing right! lol see what the third turns into
I didn't risk it due to fins and went and picked up at a summit. Don't know if that is a realistic situation for you though.
 

Sgt Gus

Full Access Member
Joined
Aug 2, 2023
Posts
868
Reaction score
1,728
Location
Texas
First Name
Mark
Truck Year
87
Truck Model
R20 3/4 ton
Engine Size
454ci/7.4L
My Dad loved the sears craftsman stuff due to the lifetime warranty. Just return and get another if needed. Most of my sockets and drives etc are S.C. My brother and I would get something every Christmas for awhile.
 

Gander

Full Access Member
Army
Joined
Aug 27, 2025
Posts
184
Reaction score
210
Location
Dirty Bay, TX
First Name
Lawrence
Truck Year
1987
Truck Model
V10
Engine Size
350 TBI
Awesome, please advise where you found the plastic clips that go on the brackets! We have the brackets (87 tbi, 454).
I was following your read thinking, wait there's a couple more wires...good job.
It’s a hassle for sure! There’s 3 different clips, and I had to get them from 3 different suppliers. Dorman 40295 was the easiest, I was able to have them ordered into the store at Advance Auto. $10 per pack, (they’re 2 sets per pack), and you need 3 packs but I got 4 to have spares. NOE 7353594 you can get from NAPA but they don’t stock it. $4 per pack and you need 4 packs plus $6 shipping. The last one is ACDelco 12132229. $3 a piece but again it isn’t stocked anywhere. I had to order them in online and pay an extra $6 in shipping.

This does result in you having a couple extra clips after it’s all done but as hard as these little buggers are to find it’s a good thing to have spares. If you’re missing the brackets like I was I found someone who sells the correct brackets for something like $30 bucks. Now, that doesn’t include the brackets on the back of the heads but I already had those. These are different than the ones on the OBS trucks, BTW. I pulled a set off at the junkyard thinking I could save a few bucks there but no dice. Here’s some links and good luck! It sure is nice not to have to have my wires tied up with zipties and laying all over the place.

Oh, BTW, I’ve got the 5.7. I’m pretty sure the clips are going to be the same but not sure about the quantities and the brackets might be a little different. Since you have a 454 take a look at those links and see if they’ll work for you and good luck!




https://newboyzsquarebodyrescue.com...?_pos=1&_psq=spark+plug&_psid=3eeeb441a&_ss=e
 
Last edited:

Gander

Full Access Member
Army
Joined
Aug 27, 2025
Posts
184
Reaction score
210
Location
Dirty Bay, TX
First Name
Lawrence
Truck Year
1987
Truck Model
V10
Engine Size
350 TBI
Awesome, please advise where you found the plastic clips that go on the brackets! We have the brackets (87 tbi, 454).
I was following your read thinking, wait there's a couple more wires...good job.
Yeah, I’ve been chasing idle problems ever since I got the truck. Everything I’ve done has improved things a little but hasn’t quite fixed it. Hooking those last 2 grounds up that I found loose while running those plug wires has it running and idling just fine. Fuel injection is a beautiful thing when it’s all working right! One of the reasons I love the ‘87 trucks so much.
 

Latest posts

Forum statistics

Threads
48,803
Posts
1,077,720
Members
43,583
Latest member
idkentid
Top