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620 KC project

Posted: 09 May 2018 08:12
by Edm620
Finally got to pick up my '76 620 project truck and have begun the process of stripping it down. I have also bought a '86 720 that will donate it's chassis for upgraded front suspension including disc brakes. Still tossing about ideas for the engine, the 620 has L20 + 4 speed, the 720 has naps-z2.4 + 5 speed. Will get both trucks stripped down before needing to make decision on what to do for the engine. I need to keep on a fairly tight budget at least for the initial build.

Definitely have some rust repair to do, rust around some of the cab mounts but still fairly solid. Sunroof will either need to be replaced or filled in, I'm leaning to keeping a sunroof but a larger size.

Re: 620 KC project

Posted: 02 Jun 2018 21:37
by Edm620
Almost ready to pull the body off the frame, have been working on the truck pretty steady. Unfortunately the engine had been swapped out at some time as I discovered an L18 residing within. That motor and 4 speed has been sold now leaving the decision as to what to propel the truck with open for the time being. How can you tell the truck was stored in a field? By the mouse nest in the heater box! I found quite the mess in there complete with the former tenant.
IMG_3871 (3).jpg
house of mouse
IMG_3871 (3).jpg (142.04 KiB) Viewed 438 times

Re: 620 KC project

Posted: 15 Jun 2018 22:26
by Edm620
Finally have the body removed from the chassis and stuffed into my cargo trailer. Whew. While to cab mount bolts came apart fairly easily, 3 of the box mount bolts proved to be very stubborn. The tab affixed to the heads were relatively useless in preventing the bolt from turning and nearly impossible to hold in place due to the offset C channels. Had to get a small diameter cut off wheel and even then could only get in partway but persistence prevailed. Next step is to bring the 720 in to get stripped down.

Re: 620 KC project

Posted: 16 Jun 2018 15:41
by datzenmike
Yeah just swap the 620 body onto the 720 frame assuming the 720 is also a long wheelbase truck, and keep the Z24. If the 720 is a short wheelbase you'll have to make a flat bed for it. Keep the 620 wiring and you'll have to convert to internally regulated alternator (on the 720) easily done. The upper rad hose on the Z24 will have to be rerouted to the left side. The heater hose on the Z24 comes out of the block, not the head. Mount the dual coils and done.