2 valve vs 3 valve
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New User
Joined: Feb 2009
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From: Crossville, Tennessee
2 valve vs 3 valve
I have a 99 SD with the V-10 and the engine has 90000 miles. I have been thinking of changing engines sometime in the future and have been wondering if I can replace the 2 valve with a rebuilt 3 valve long block. Would that be a fairly ease exchange or should I just forget it....! The ole 2 valve is doing great but I pull a 38' fifth wheel at about 18000 total weight (both truck and trailer). Thanks.
9 ECHO 1
Joined: Aug 2009
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From: Missouri
I have a 99 SD with the V-10 and the engine has 90000 miles. I have been thinking of changing engines sometime in the future and have been wondering if I can replace the 2 valve with a rebuilt 3 valve long block. Would that be a fairly ease exchange or should I just forget it....! The ole 2 valve is doing great but I pull a 38' fifth wheel at about 18000 total weight (both truck and trailer). Thanks.
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New User
Joined: Feb 2009
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From: Crossville, Tennessee
99 F250 SD V-10
so I'm not going to be pulling a 5th wheel much longer anyway. Thanks for answering.
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Joined: Jan 2009
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I wouldn't worry about the plug blow out unless you have a jockey for a mechanic.... As long as they are torqued down correctly they will last for a while... plus how many miles do you have on the truck and why so many plug changes?
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New User
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From: Crossville, Tennessee
2V vs 3V
I have 90,000 on the truck now. I changed the plugs at 70,000 and all was well for awhile, and a miss developed. It kept codeing "verious cyls misfiring" so I changed them again. Turns out is was a bad fuel pump. I picked up some bad gas that stopped up the frame filter and it ran ok after that change but then came back, unbeknost to us the in tank filter was clogged too. So we changed the pump and all and haven't had any issues since.
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Postmaster
Joined: Jun 2008
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From: Wayyy NoCal, USA
If you have been installing and torquing the plugs correctly, the threads will last forever.
The 2V to 3V conversion is rather difficult because of the electronics. The only PCM's available for 3V also need to see the 5R110 tranny AND the buss electronics.
The other approach is to convert a 3V long block to use 2V electronics and throttle body. That will require fabrication (particularly getting a cam timing sensor to work correctly).
On the other hand, I found the the PI head and intake conversion to be well worth the effort.
The 2V to 3V conversion is rather difficult because of the electronics. The only PCM's available for 3V also need to see the 5R110 tranny AND the buss electronics.
The other approach is to convert a 3V long block to use 2V electronics and throttle body. That will require fabrication (particularly getting a cam timing sensor to work correctly).
On the other hand, I found the the PI head and intake conversion to be well worth the effort.
Hotshot
Joined: Mar 2007
Posts: 10,101
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From: Pa
The difference between the 2v and 3v isnt all that significant. Obviously you will be better suited towing with the 3v. However, the 3v only gives you 30 more horses and 67 more ft/lbs of torque. Im guessing a rebuilt 3v is going to cost in the neighborhood of $2-3000. I would reinvest that money into upgrades to your current motor. $3000 in upgrades will give you more than 30HP and 67ft/lbs.
The 3V short block is useable with the 2V components but thats about it. I have never seen anyone successfully swap a 3V V10/5R110 combo into a 99-04' SD. Honestly you would be better off just buying a used 05' up truck with a 3V unless you have a lot of extra time and money. Or just swap in a later 2V PI long block.
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Joined: Jul 2010
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From: Fort Worth
There is more of a difference than you think. Not just in hp and tq numbers but in the physical parts of the engine, control system and some bolt on components. An NPI 2V 6.8l makes 275hp and 410 tq where as the 3V 6.8l makes 362hp and 457tq, so thats an 87hp and 47tq difference.
