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what blocks to stay away from

DB2 is the mechanical 6.2/6.5 pump. DB4 is the version that FORD used on the 6.9/7.3 and is also the rotary pump that STANADYNE made for most other diesels. The DB4 also spins the other direction.
 
THEFERMANATOR said:
DB2 is the mechanical 6.2/6.5 pump. DB4 is the version that FORD used on the 6.9/7.3 and is also the rotary pump that STANADYNE made for most other diesels. The DB4 also spins the other direction.
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The term is also used by the 6.5 community to designate the difference between the standard 2-plunger DB-2 pumps and the 4-plunger DB-2 used for some marine engines. It does, however, rotate in the opposite direction such as the ford DB-4 IIRC, but has successfully been used on high hp 6.5's in the marine application.
 
Stay away from a 97 506 block. 94-95 599 blocks that are still around are thought to be the best. The 2000 year block is also though to be better than 98-99, but really any of them will work so long as you dont overheat it. There was a 96 929 block, the might be good, but rebuilders would all prefer the 599 it seems over the 929.

97 started the oil squirters, for piston cooling, and that mod caused a lot of cracks, and they revised the size of the passages and made them better after 97.

92-93 6.2L 599 blocks might even be better for you.
 
THEFERMANATOR said:
DB2 is the mechanical 6.2/6.5 pump. DB4 is the version that FORD used on the 6.9/7.3 and is also the rotary pump that STANADYNE made for most other diesels. The DB4 also spins the other direction.
Click to expand...

The 6.9/7.3 used the DB4? I thought it was the DB2. All the ones i've seen have the DB2, but it's slightly different from a 6.2s DB2.

AK Diesel Driver, as far as blocks i'd agree with what the others say. Avoid the 97 506's. Heck i'd avoid all the 506 blocks save for the ones with the Navistar logo in the valley, but that's just me. A 599 block would be a good choice as well. I know there s a 141 and a 929 block out there too, but i can't remember what years they were other than they were all before the 506 block.
 
Anubis said:
I found a 2000 block but the guy thinks it has a broken piston ......... $400.... would it be worth it for the heads?
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Well, I would wonder how sure the guy is. What his problem or symptoms were. Worth it if the piston and a valve is the only thing broke. Ask if its the #8 cylinder, in which case it probably has other colateral damage. MGW seems to be resident block expert, as far as ways they break.
 
iamdave0887 said:
The 6.9/7.3 used the DB4? I thought it was the DB2. All the ones i've seen have the DB2, but it's slightly different from a 6.2s DB2.

AK Diesel Driver, as far as blocks i'd agree with what the others say. Avoid the 97 506's. Heck i'd avoid all the 506 blocks save for the ones with the Navistar logo in the valley, but that's just me. A 599 block would be a good choice as well. I know there s a 141 and a 929 block out there too, but i can't remember what years they were other than they were all before the 506 block.
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The DB2 and DB4 look pretty much the same, but the NAVISTAR engines did have the DB4.
 
The 6.9/7.3 ran the 2 plunger DB2 also, but they do spin the opposite way. They didn't run enough hp stock to need the 4 plunger pump fuel output like found on the marine versions and other 4 plunger stanadyne pumps found on heavy equipment.
 
Anubis said:
I found a 2000 block but the guy thinks it has a broken piston ......... $400.... would it be worth it for the heads?
Click to expand...

i would see if he will let you pull the pan off it and look to see how the piston is broken. when mine broke it caused alot of other damage.

im ganna try and head out today to look at a 599 block a couple hours from here and the guy is nice enough to let me pull the pan and check for main web cracks might have to pull crank as well
 
if I have a 94 then don't I have a 599 block?

my goal is to have a running low mile take out I can drop in and use my truck while I rebuild the engine thats in it..... i was thinking of a 6.2 military take out but I don't want to spend $900 plus shipping just so i can spend $1500 - $2000 on a rebuild...... at that point I might as well just spend a little more and get a 6.2/6.5 hybrid...... Problem is I don't have a little more and I was planning on rebuilding my engine over time......... I am not looking for something to rebuild.


I called the guy back and it was a military take out ........ low compression on the #8 cylinder and no oil pressure...... blown piston?
 
Anubis said:
if I have a 94 then don't I have a 599 block?

my goal is to have a running low mile take out I can drop in and use my truck while I rebuild the engine thats in it..... i was thinking of a 6.2 military take out but I don't want to spend $900 plus shipping just so i can spend $1500 - $2000 on a rebuild...... at that point I might as well just spend a little more and get a 6.2/6.5 hybrid...... Problem is I don't have a little more and I was planning on rebuilding my engine over time......... I am not looking for something to rebuild.


I called the guy back and it was a military take out ........ low compression on the #8 cylinder and no oil pressure...... blown piston?
Click to expand...

Not sure if a blown piston would cause the lack of oil pressure, my gut tells me no. A blown piston would definitely cause the low comp on that cylinder.

Sounds like that engine your looking at will be more trouble than it's worth. No oil pressure could also lead to spun rod and main bearings, a chewed up crankshaft, etc.
 
92-94 are all 599's.
95 is a 929 is identical to the 599.
96 is a 141 has the casting on the back for a rear mounted turbo, not always tapped or used, no sprayers.

1997-1998, pretty much a scary block, roll the dice kind of thing. I know a builder that has a stock pile of these because they won't build them because they're afraid they'll just come back. Main concern is the piston oil spray hole cracking and making it's way to the bores. These are all non-cracked blocks on the mains and everything, just gamble engine. I'm not afraid of one if it get's splayed (which I'm doing to one this winter).
 
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