detroit 60 series engine block 11.1 to 12.7.

I've owned an 11.1 and 12.7. Detroit hasn't made an 11.1 in quite some time so I doubt swift would still have any. Here you might learn something on your smartphone. I can see you're not going to last long here.
http://en.m.wikipedia.org/wiki/Detroit_Diesel_60

 

So the 12.7 is 6 cycle? Your excuse doesn't make sense. Just admit you were 100% wrong and go on. Your arrogance is unwelcome here. I saw in another thread where you called FLATBED a liar.

 

Nobody really cares what you've done here. You came into a thread 100% wrong, posted arrogantly, then post some BS excuse about cycles when you're proven wrong. This isn't the lunch counter.

 

The series 60 has always been 6 cylinders, it's not "now". You're a piece of work. Enjoy your time here, as I don't see you lasting very long.

 

My 91 was DDEC2, so a 90 has a good shot at it. johnP3 would probably know the years, but check the engine serial # for sure because who knows what's happened to the truck in 25 years. If it's not on the valve cover anymore, it's stamped in the block under the intake manifold. I had to use chalk to see it after degreasing. My 93 was a DDEC3.

 

Your second post in this thread. This entire post is lie/false/untrue/misinformed, whatever. This has nothing to do with cycles, strokes whatever. Have a nice day at the driver counter.

 

Maybe you should quit drinking. See the above post.