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Old 12-22-2015, 11:30 PM   #51
Jake Wade
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Re: 79 K20 Custom Deluxe - Goldy LS1

I am a Gen 1 guy, I take it a LS 5.3 block(3.78) can safely be bored to (3.90), obviously since you have done it.
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Old 12-23-2015, 10:07 AM   #52
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Re: 79 K20 Custom Deluxe - Goldy LS1

The iron blocks(mine anyways) was bored and sonic tested and all good.
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Old 12-23-2015, 10:09 PM   #53
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Re: 79 K20 Custom Deluxe - Goldy LS1

What method did you use to change out the cab mount bushings? Did you raise cab off frame one side at a time?
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Old 12-23-2015, 10:17 PM   #54
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Re: 79 K20 Custom Deluxe - Goldy LS1

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What method did you use to change out the cab mount bushings? Did you raise cab off frame one side at a time?
Yes, I had the frame resting on 2x4 square tube, then raised each side just enough to change them, seemed to work out good and keep everything aligned.
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Old 12-28-2015, 10:22 AM   #55
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Re: 79 K20 Custom Deluxe - Goldy LS1

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I am a Gen 1 guy, I take it a LS 5.3 block(3.78) can safely be bored to (3.90), obviously since you have done it.
oddly enough, the aluminum 5.3 is very sought after for building big engines. I've seen them sleeved and running bores in excess of 4.125, apparently they're stronger than the car blocks too.
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Old 01-10-2016, 11:38 PM   #56
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Re: 79 K20 Custom Deluxe - Goldy LS1

I finally had some time to get a video up, it's been crazy trying to find time for the old Square! I got a call on Christmas Eve about a very special baby that needed a home, so we added another to our family. It's been a sleep deprived whirl wind. Shifters are fabbed up, I think I will need to weld a washer at the end sort of like a shoulder, I believe that will help with the deflection, you will see what I'm talking about in the video. Then I got working on my crossmember after I received the transfer case mounting kit and misc parts.
















I still need to finish welding the crossmember etc but at least it's fabbed up. I don't see any reason why that wouldn't be strong enough.
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Old 01-11-2016, 01:19 AM   #57
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Re: 79 K20 Custom Deluxe - Goldy LS1

Looks good! Keep adding to the family and you will need a crew cab!
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Old 01-11-2016, 10:10 AM   #58
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Re: 79 K20 Custom Deluxe - Goldy LS1

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Looks good! Keep adding to the family and you will need a crew cab!
Thanks! I would love to do a crew, I just can't fit it in my garage!
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Old 01-23-2016, 08:51 PM   #59
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Re: 79 K20 Custom Deluxe - Goldy LS1

Video update, found a nice harness at the wrecking yard, separated and pinned it out, and a few other things.

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Old 01-25-2016, 02:59 AM   #60
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Re: 79 K20 Custom Deluxe - Goldy LS1

Exhaust work this weekend!

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Old 01-25-2016, 04:29 AM   #61
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Re: 79 K20 Custom Deluxe - Goldy LS1

Good work. I'd like to do my own exhaust on my 3+3 when I get that far. We'll see how my patience is holding up at that point.
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Old 01-25-2016, 10:17 AM   #62
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Re: 79 K20 Custom Deluxe - Goldy LS1

Thanks Marcus, I'm sure you will still have some left lol
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Old 01-29-2016, 09:31 PM   #63
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Re: 79 K20 Custom Deluxe - Goldy LS1

Loving the build man, keep the videos coming, I look forward to them.
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Old 01-29-2016, 09:35 PM   #64
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Re: 79 K20 Custom Deluxe - Goldy LS1

How to you determine your length/angles when cutting the pieces to make the S bends for the exhaust piping? Do you use math?
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Old 01-30-2016, 03:11 AM   #65
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Re: 79 K20 Custom Deluxe - Goldy LS1

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How to you determine your length/angles when cutting the pieces to make the S bends for the exhaust piping? Do you use math?
Thanks Jake! Math lol... I actually just cut a bend I had and then turned it 180deg which happened to come out just about right.
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Old 02-01-2016, 12:15 AM   #66
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Re: 79 K20 Custom Deluxe - Goldy LS1

This weekend I got the core support back in place.







Good clearance for my winch mount location, so far!


PCM bracket made, just needs to be mounted!




The video!

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Old 02-01-2016, 03:50 AM   #67
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Re: 79 K20 Custom Deluxe - Goldy LS1

Good progress. I may have missed it, but are the K20 axles staying on the K10 and vice versa?
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Old 02-01-2016, 10:44 AM   #68
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Re: 79 K20 Custom Deluxe - Goldy LS1

Thanks Marcus! Yes the 8 lug stuff will be staying in the K10 and the welded up 14 bolt sf / 10 bolt will stay in the K20 (trail rig)
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Old 02-01-2016, 04:08 PM   #69
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Re: 79 K20 Custom Deluxe - Goldy LS1

Cool build!

A suggestion on your mount. Run gussets from the front edge back to the fire wall. With the amount of vibration an off-road toy will see it may end up cracking the firewall without the gussets. Also, grind large radiuses onto any corners contacting the sheet metal. Sharp corners or small radiuses will likely tear into the sheet metal.

Another reason to limit the movment of the bracket is, depending on how high on the firewall its mounted, it could start to seperate the dried out seam sealer in the cowl if it flexes a lot. Probably not as big of an issue where your at but up here that's an area that likes to rust out.
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Old 02-01-2016, 04:21 PM   #70
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Re: 79 K20 Custom Deluxe - Goldy LS1

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Originally Posted by 400/400 View Post
Cool build!

A suggestion on your mount. Run gussets from the front edge back to the fire wall. With the amount of vibration an off-road toy will see it may end up cracking the firewall without the gussets. Also, grind large radiuses onto any corners contacting the sheet metal. Sharp corners or small radiuses will likely tear into the sheet metal.

Another reason to limit the movment of the bracket is, depending on how high on the firewall its mounted, it could start to seperate the dried out seam sealer in the cowl if it flexes a lot. Probably not as big of an issue where your at but up here that's an area that likes to rust out.
Thanks and Thanks for the heads up!
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Old 02-05-2016, 02:02 AM   #71
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Re: 79 K20 Custom Deluxe - Goldy LS1

What are your thoughts of the PCM mounting location? I still have to add more support but I think it could work and it's out of the way.





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Old 02-11-2016, 10:37 PM   #72
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Re: 79 K20 Custom Deluxe - Goldy LS1

Looking good! This thing is going to be a beast.

I would worry about the PCM getting really hot right there above the headers???
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Old 02-12-2016, 05:35 PM   #73
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Re: 79 K20 Custom Deluxe - Goldy LS1

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Looking good! This thing is going to be a beast.

I would worry about the PCM getting really hot right there above the headers???
Exactly what I thought before i read your post.

Why do you want it mounted to the engine ?
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Old 02-13-2016, 01:12 PM   #74
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Re: 79 K20 Custom Deluxe - Goldy LS1

I think it looks clean. You could fab up a little heat shield for it that goes below the pcm maybe?
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1991 V3500 L29 454 4L80E NP205 D60/14 Bolt 4.56's
1984 K30 292 TH400 NP205 D60/14 Bolt 4.56's flat bed 7'6" Meyer Plow
2022 Silverado 3500 L8T
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Old 02-13-2016, 03:17 PM   #75
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Re: 79 K20 Custom Deluxe - Goldy LS1

Thanks guys, I like the Idea of having it on the engine and out of the way, less wiring running all over the engine bay. If in the future it's an issue I'll come up with a solution.

Speaking of wiring, I started getting all of my plugs going and the pcm re-pinned. I did have to make a trip to the wrecking yard for plug ends but overall I'm happy with the 27 dollar harness. It's still a mess but it will come together, organized chaos!











An Idea of my lift and how much the axle has moved forward.


The Video

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