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Old 11-20-2014, 09:36 PM   #25
Vintage Windmills
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Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
Re: K30 Downgrade to Cummins Project

Quote:
Originally Posted by Dieselwrencher View Post
Jud, it sounds like your engine has the basic fuel screw turned in a bit. Here is what I'd do to make it an awesome hauler and mileage unit. 3200gsk in the injection pump, turn the fuel screw to where you desire and adjust the afc, DennyT Stage II fuel pin, 5x.012 injectors, HX35w from a late 94 up 12v, advance the timing on the IP, and keep an extra lift pump with you or go ahead and upgrade to a low volume piston lift pump. Or even an Airdog or Fass. I have a new cummins one on my truck but these are a diaphram pump and don't live as long as the piston pumps. You will need a little beefier clutch as well to handle the extra power.
Quote:
Originally Posted by Dieselwrencher View Post
See if he has the piping as well. Your turbo outlet and engine inlet are 2.5" and the 2nd gens are 3". I'd see if he has the newer vac/ps pump as they are a better design, see if he has a good or core HX35W, and the upper intake off the engine. If he has a fan blade/fan clutch, grab that too.
Ryan, All this is tempting but sure is complicating things. Are you saying it won't hold 40mph in the mts or steep hills towing unless I do this? Just going for a simple build here, truck will probably only log 5000 mi a year in reality. Just want enough to do the basics, and keep total additional expenses under $2k. I think I'll invest in a new or better clutch setup as this one was a tad "hoppy" starting out.
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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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