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454 c30 to 6.2 Diesel or Detroit?

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9.2K views 10 replies 7 participants last post by  High Sierra 2500  
#1 ·
Hi Everyone,

I just come across your forum and signed on immediately because I need some help deciding what to do. I will preface the message by saying that I am a newbie when it comes to trucks. I can work on old Austin Healey roadsters or BMW's, but big american dually's are a new gig for me.

I was given a 2wd 1980 C30 Regular Cab Dually (with a 5th wheel hitch in the bed, and a class III hitch under the rear bumper) from a neighbor. He is a retired Veterinarian who used it to pull his horse trailer. He has since purchased an '06 Crew Cab Dually because he says he wanted more interior room. My truck has a very tired 454 gas engine with a 4.10 rear and 4speed manual with a REALLY low 1st gear. I have to add a quart of oil every fillup because both head gaskets are shot. I plan to use the truck to pull a 28ft enclosed race car trailer between April and November (short race season up here in the Northeast), and otherwise the usual run to Home Depot or the lumber yard. I have three scenarios that I am looking at to keep this truck on the road:

#1. Replace the tired 454 gas engine with a replacement 454 that I purchased a few years ago out of a truck that was totaled.

#2. Replace the tired 454 with a free 6.2 Diesel from a rotted out early 80's truck that would otherwise go to the crusher. My buddy found it in a yard up the street from him. Not sure of the motor's condition.

#3. Replace the tired 454 with a Detroit Diesel motor, and auto tranny, out of a GMC Panel Truck that was a Snap-On truck that cracked its frame. This guy is a neighbor near me that says he blew a headgasket at 100K miles and when it was replaced, he installed larger head bolts from a later Turbo model. it now has 20K on the "new" motor. The frame rails on the C30 are wide enough to accept it, but custom motor mounts will have to be made, along with some other Monster Garage stuff I'm sure. I should have asked what the motor was, but this guy is a gruff old farmer that said "Hell, yeah, it'll work".

So, what do you all think of this project?
Thanks in advance for your insight.

JagerRacer
 
#2 ·
Running the diesel will save you money you can put in you're race car's tank instead of the truck's. Which Detroit?
 
#4 ·
The 6.2 is a detroit. Is this Detroit your talking about a inline or a v8. It's probably a 8.2l which would pull pretty good if you could fit it in. Also gonna need to beef up the front suspension if it's a 8.2.
 
#5 ·
Welcome to the forum!

Yeah, the 6.2 is a Detroit Diesel... :cool:

I would recommend one of the diesels for a couple of reasons... Fuel economy and durability. There is no comparison between the fuel economy of a 454 and the fuel economy of a 6.2. The larger Detroit will naturally get slightly worse fuel economy, but still much better than a 454. Also, diesels have much more torque, which is great for towing.

As far as the 6.2/larger Detroit diesel option goes, it really depends.

The 6.2 has the advantage that it will bolt right in, no cutting or fabrication necessary, but it won't be as powerful as the larger engine. It will still do all right and get excellent fuel economy, but it's no 454 powerwise. If you turbocharge it, you will get pretty respectable power out of it, but turbos are expensive.

The larger Detroit (it would help to know which model) engine will have more power, but will be more difficult (possibly much more difficult) to install. In addition, I don't know what tranny you would use with it... I feel pretty certain it doesn't have the same bolt pattern as a 454, so you would probably be stuck with whatever tranny is in the van. How well that tranny would fit is hard to say... It is fairly certain that some driveshaft modifications would be necessary. Also, suspension upgrades will probably be necessary to handle the weight of the engine.

It really depends on how much work you want to do...

Hope this helps! :)
 
#6 ·
If it's an 8.2, the engine is over 1100 lbs! Get some big springs and weld-on frame reinforcements! The bell housing is a truck class housing, adapting to anything short of a Clark 282 5 speed is going to require some engineering.
 
#7 ·
The 8.2 would be a tonne of work but it'd be a real tow monster.
 
#8 ·
True, but the horsepower is very low. Not a high rev engine. Governor is 3100 no load. Loaded, don't know but not much higher. Horsepower was rated at 205 for the turbo and around 160 N.A.
 
#9 ·
The local snapon guy around here used to have a n/a 6.5 in his van, so that could be what you are looking at.
 
#10 ·
I think the 6.2 would be a poor choice to move that size truck and a trailer. They are only 135 hp, 100 less than the big block. It would be economical to run, however.
 
#11 ·
It's more like 150 hp.

No, it won't be a drag racer, but it will get excellent fuel economy and once you are up to speed it will be fine.

Probably the best solution would be a more powerful diesel... That way you get the fuel economy and the power...