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!