http://www.turbodieselregister.com/forums/showthread.php?t=95125 - thought this might interest y'all.................I'd LOVE to have this. 
CK5
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Wanna see a running SubCummins conversion?
- Thread starter BurbinOR
- Start date
eclipse
1/2 ton status
Awesome!!! inspiration for all of us. I have an 84 c20 (first project to make it a K20) and it has a dead 6.2 diesel which I was planning on putting in a 454, but I'm really leaning toward a cummins 12v! 
Kutos to him for going with a 24v motor. He did a great job under the hood...
his...
Mine...
He did a great job under the hood...his...
Mine...
eclipse
1/2 ton status
Whats the biggest difference in doing a 24v swap instead of a 12v swap? I know you have computer controllers. And what would you do with them on a 24v swap?
A 24v comes with an electronic VP44 Bosch IP, so if one were sticking with that, he would plan on an ECM install, too. A P pump conversion allows for the use of a mechanical Bosch P7100 IP which simplifies electrical stuff. Also, 24v heads already come with the much sought-after 60 lb valve springs to which many 12v owners convert. Flow isn't clearly superior as a 12v head flows very close to a 24v - ported or not.eclipse said:
eclipse
1/2 ton status
Haha still learning diesels here, so I"m a little confused. So your saying that you can switch to a mechanical pump on a 24v and that will eliminate some computers? So would this a conversion to a chevy easier?
"Also, 24v heads already come with the much sought-after 60 lb valve springs to which many 12v owners convert. Flow isn't clearly superior as a 12v head flows very close to a 24v - ported or not."
So the 24v heads have more flow with the 60 pound springs?
Sorry I'm such a newb on diesels
"Also, 24v heads already come with the much sought-after 60 lb valve springs to which many 12v owners convert. Flow isn't clearly superior as a 12v head flows very close to a 24v - ported or not."
So the 24v heads have more flow with the 60 pound springs?
Sorry I'm such a newb on diesels
Any conversion that doesn't involve adapting 'puters to the truck is always simpler.
The 60 lb valve springs allow for the use of a more aggresive cam profile. By themselves, they don't improve air flow to the cylinder.
A 24v head is capable of flowing a greater volume of air than a 12v, but not by such a large amount that it offsets the extra effort required to adapt a P7100 to the motor package. Porting a 12v head, which is already setup for the mechanical pump, is a better hp/$ value than converting a 24v.
The 60 lb valve springs allow for the use of a more aggresive cam profile. By themselves, they don't improve air flow to the cylinder.
A 24v head is capable of flowing a greater volume of air than a 12v, but not by such a large amount that it offsets the extra effort required to adapt a P7100 to the motor package. Porting a 12v head, which is already setup for the mechanical pump, is a better hp/$ value than converting a 24v.
BlueBlazer
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Actually the 60 lb springs are to keep the valves from floating when a governor spring change is done which results in higher engine speeds before defueling. They should be used with a stock cam as well.
Oh wow. Marking for perusal/fantasy.....
