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Old 11-13-2014, 09:51 PM   #1
Vintage Windmills
Vintage 4x4s
 
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Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
K30 Downgrade to Cummins Project

This is about a 1986 K30 crew cab that I bought out in Seattle. I have not personally seen the truck yet. I did thorough recon though I bought since I think its probably the simplest way to get a cummins powered 4x4 chevy. This truck is rust free or close to. I am going to plan this awhile and not do any wrenching on the truck until its ready to go, unless I just replace the trans for now.

Plan was to pull the engine and put in a Cummins. I think I will do that for efficiency, even if its a step down in power It will be unless I turn up the cummins. After I agreed to purchase, he provided Dyno sheets proving it has 575 ft lbs and 475 HP. The trans is blown, can you believe it?? The debate I'm having with myself is if I should go fuel injection and overdrive and keep the 502. I think the fact that the BBC is built for 91+ octane will be the determining factor to go with the 1990 6BT/G360/NP205 in the shed I'm tripping over.

Pics and description of purchase procedure to follow. It was quite a process to buy it and get it lined up for shipping
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades)
67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore )
86 CHV K30 502 th400, apple red NEW
71 CHV K20 350 SM465, ochre (saved work truck)
71 CHV K20 292 SM465, white, tach, PTO, (future project)
72 CHV K20 350 350th, medium blue (project stocker)
01 CHV K2500hd crew, indigo blue

^3 dont run and the others don't see winter either
'86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649
'71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642
'72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6
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