Re: 4x4 1971 K20 build
 

Thank you.

Here's the crossmember. As of now it weighs 42 lbs. 1/4" and fully boxed. This shall keep my dirtymax calm no matter what.

Re: 4x4 1971 K20 build
 

Lol. That should do the trick.
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Re: 4x4 1971 K20 build
 

I'd hope. Transfer case is finished

Re: 4x4 1971 K20 build
 

Bought some welds wrapped in 37s

Re: 4x4 1971 K20 build
 

No pics?

Re: 4x4 1971 K20 build
 

They are getting shipped out today. Got a great deal. They need cleaned up.

Re: 4x4 1971 K20 build
 

Nice, they look pretty good.

Re: 4x4 1971 K20 build
 

Slow progress

Re: 4x4 1971 K20 build
 

I was really hoping for it to be done by now but it will all be worth it. Got a heavy duty crossmember put in. Made all of 1/4" thick steel. I also bought a 14 bolt 11.5" rear out of an 8.1 and it is now installed, just needs painted. Now I'll have a huge u-joint with disc brakes. If anyone needs rebuilt 71 k20 axles I got em! All of the intercooler plumbing is on its way. The rear drive shaft should be finished soon as well. I also bought a fun daily since I have a 60 mile round trip for work each day.

Re: 4x4 1971 K20 build
 

Well the duramax finally runs now after new injectors. It now has an 8" lift as well. I bought a new trans cooler and i now need to order crossover steering.

Re: 4x4 1971 K20 build
 

That is one bad to the bone project man. A 1971 with a D-max and an LS1 daily driver.....:chevy:

Re: 4x4 1971 K20 build
 

Thanks! The LS is amazing, fun and reliable. It also averages around 21MPG.

Re: 4x4 1971 K20 build
 

Awesome on all accounts! Too bad you had to replace the injectors but at least it is running and you know they are new now.

Re: 4x4 1971 K20 build
 

I know its an old thread but hopefully you'll still get notifications. What radiator did you use? Motor mounts?intercooler?

A champion radiator, custom front crossmember, and a universal mishimoto intercooler. If I were to redo it all over again, I’d either go a custom cooling package or run the duramax frame to allow the duramax cooling package to fit. The duramax cooling package is too tall for a stock frame truck as there is not enough room between the frame and hood and/or hood latch.
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Re: 4x4 1971 K20 build
 

So you had a radiator made to fit? Or bought one that kinda worked? Also what motor mounts? Adapter plates and old mounts? Duramax mounts?

I bought a radiator that is made for a 71 K20, just an aluminum one. If you’re running a manual you’d probably be fine but the Allison needs at least a 1/2” hose for the trans cooler running through water, which narrows you to only using a duramax rad. I have a double stacked air to fluid cooler with a fan and it barely keeps it cool enough just cruising. For mounts I used motor mount plates and had eyelets welded to it and it bolts to the custom crossmember using two bolts. So All custom pretty much
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Re: 4x4 1971 K20 build
 

Sorry to hear its giving you issues. I wonder if a cummins radiator could be used they fit under a 69-72 hood

Re: 4x4 1971 K20 build
 

I see the words - for cruising - in your reply. That indicates that there may be some progress. How about an update? That's quite a rig you have built.

I believe a stock style radiator with a manual fan would be great. Mines does okay with electric fans but the trans gets warm.

Here is the unit. I’ve got about 8k miles on it since it’s been road ready.
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Re: 4x4 1971 K20 build
 

Here, fixed it. They thing is a beast!