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Old 11-15-2014, 11:25 AM   #8
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
475hp and spark plugs plus towing equals stop at every gas station.
Yep, but $3 gas and $4 diesel does make a guy do the math

Quote:
Originally Posted by ryanroo View Post
oh i bet that would be a FUN motor it a shorter truck, something a little more nimble.

i would say a 6bt is using the truck better.
I think you're right, this will be a tow rig, going to the remote western US so towing efficiency is paramount. Will also be a pain to find 91 octane in MT and other western states.

Quote:
Originally Posted by burnin oil View Post
The Cummins will definatly be the way to go. The only thing bad is the rotary pump. I will never make the power of BB horse power wise. Swapping to a p7100 pump will let you. Either way you should easily have more torque than the big block. Just don't forget that the Cummins is heavier so you will need to build a little more torque to motivate it. My 700HP 12v got 18.5 MPG driving in traffic.
Cool, I'm not after crazy HP, just enough torque to get through the mountains at speeds of 40mph or greater while pulling 14,000 lbs.

Quote:
Originally Posted by ryanroo View Post
i am betting Jud is not looking to make a magazine truck, but more a usable old chevy that is kind of cool to boot. the ve motor is a great way to do that. 350-400 HP with the torque numbers a 6bt will put down with that HP is more than enough to make a guy smile when he pushes the skinny pedal.
Indeed, I'm saving the show quality effort and $ for the older K20's. THis is just the quickest way to get a tow rig capable of pulling 16000 lbs reliably and safely. Trucks already got airbags and hydroboost!! I pretty much like it the way it looks now (stockish, unmolested, nicely aged). Running boards have to go though!!

Quote:
Originally Posted by patdaly View Post
Yep, the dynamic timing of the VE is a definite plus, not to mention it should get a tick better mileage and start instantly....... I have the VE on my 4BT and the P7100 on my 6, hard to see any advantage of the P7100 until you get well past reasonable HP numbers.
Effieciency is more important to me than crazy power.
__________________

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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