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Old 01-24-2008, 12:30 PM   #12
67_C-30
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Join Date: Jan 2005
Location: Sweet Home Alabama!
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Re: Diesel Conversion

Quote:
Originally Posted by JAKES 68GMC View Post
Doesn't make alot of power??? You don't think 300 ft. lbs of torque for a 239 cu. in 4 cylinder is alot of oomph?
300 ft lbs is not bad, but it still only makes 80-120 HP. Its the same principle as to why you took the V6 out of your truck. The V6 makes much more torque below 2500 than your 350, but your 350 is much faster and is better suited for a daily driver. The 4BT peaks at 2500.

Let me say that the best diesel engine on the market is the 5.9L Cummins.
If given the unlimited resources, that would be my choice. However, the 6.2's/6.5's are by far the easiest to swap, and are very reliable, economical engines IMO. I have always got 20+ mpg out them of the except in a Military CUCV that had a TH400 and 4.56 gears. It got about 16 buzzing along at almost 4000 rpm on the highway. My K1500 has got as good as 27 on the highway with the 700R4.

Another aspect is noise. The Cummins are noisy and as others have said the 3BT rattles like a tractor engine. I drove a bread truck once that had one it rattled everything in it. The 6.2/6.5's are fairly quiet and real smooth going down the road. The V design is much better balanced that the L blocks.
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435
‘72 C-10 SWB , 350 4bbl, TH350
'69 C-10 SWB , 250 L6, 3 OTT
'69 GMC C3500, dump truck, 351 V6, NP435
'84 M1009 CUCV Military Blazer

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