LB7: What to look for in used long block?

[melms23]

^^ good advise right there. Dual disc and a good set of injectors would be the first things on my list. You could do studs when doing injectors. 450hp would be no problem.

 

[fl0w3n]

Do not use the single disc. Pony up and buy the street 650 dual disc. The single won't hold a 100hp tune.. I know

Good feedback. Can you tow fine with the street 650 DD? And how's it drive on the street, I'd assume fine with the name...

I'm not opposed to bumping the power and clutch, but I'm not racing it or sleds or anything. I did love my LBZ with a big tune from Rob... but I don't necessarily need that with this truck. I don't want to temp myself with 4wd launches and thrashing lol

 

[fl0w3n]

^^ good advise right there. Dual disc and a good set of injectors would be the first things on my list. You could do studs when doing injectors. 450hp would be no problem.

You mean by replacing each stud one at a time, or fully pulling heads to do injectors and studs?
I asked earlier but got no response, at the power levels I'm looking at (even if you bump to 475-500) am I going to see any benefit in studs?

 

[2004LB7]

At the power level you are looking for no reason for studs. But yes, one stud at a time leaving the heads in place.

 

[fl0w3n]

Curse whoever advised me to stay away from the SB single disk, and do the SB dual disk rated for 650hp

Of course now that means the gears are staring to turn in my head and the 425hp seems to be slipping out the window. :coolspot:

 

[torqued2dmax]

Curse whoever advised me to stay away from the SB single disk, and do the SB dual disk rated for 650hp

Of course now that means the gears are staring to turn in my head and the 425hp seems to be slipping out the window. :coolspot:

Each time those gears turn in your head , another $1000 goes with it ! LOL !

 

[Dozerboy]

Unless you’re towing a heavy camper you don’t need any more power. I never see high-power Diesel’s Offroad do any better then more moderately powered ones. Unless it’s a mud truck sitting on AG tires and turning serious rpm’s.


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[SmokeShow]

You mentioned switching to a 205 xcase. Don't do that. The 261/263 is much stronger in pretty much every way. Use a 78-79 HP D60 if you insist on switching to a D60 front axle. That'll put the pumpkin on the correct side to allow you to keep the rest of your stronger stock HD drive line. :thumb:

And 14BFF rear? you aren't putting that in place of the rear end in your 2002 are you? Again, don't do that. The old 14b is not nearly as strong as the rear end already in your truck.

 

[fl0w3n]

Each time those gears turn in your head , another $1000 goes with it ! LOL !

I sure believe that

Unless you’re towing a heavy camper you don’t need any more power. I never see high-power Diesel’s Offroad do any better then more moderately powered ones. Unless it’s a mud truck sitting on AG tires and turning serious rpm’s.


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Right now I just have a ~6-7k boat trailer to tow, and the occasional car/truck haul. in the future I'll build a crawler hauler though. That'll come in anywhere from 12-15k depending how I build it. I won't need the power for Offroad, intact I'm concerened about breaking stuff from too much power.

Again it's kind of a jack of all trades master of none, too big to seriously haul massive loads, too big to hardcore Offroad without damage, too few parts towards make it "fast", too basic interior to make it a a luxury cruiser.

But, it'll pull most anything I happen to throw at it, it'll go most anywhere I point it Offroad, it'll be fun to drive with the clutch and power level, and it'll be comfortable and fun enough for road trips.

You mentioned switching to a 205 xcase. Don't do that. The 261/263 is much stronger in pretty much every way. Use a 78-79 HP D60 if you insist on switching to a D60 front axle. That'll put the pumpkin on the correct side to allow you to keep the rest of your stronger stock HD drive line. :thumb:

And 14BFF rear? you aren't putting that in place of the rear end in your 2002 are you? Again, don't do that. The old 14b is not nearly as strong as the rear end already in your truck.

I already have the 205 with a twin stick kit, so selectable Hi/Lo separately for front and rear, or rwd Hi/Lo, or front wheel drive Hi/Lo. Also, in the future I may add a NP203 gear box to the 205, or just spring for a Magnum Box.

I already have the Chevy Kingpin D60 with passenger drop and crossover steering, rebuilt kingpins, and 4.56 gearing

I also already have 4.56 gears and a Detroit locker for a full float 10.5 14b. That's the one item I'm not 100% sold on, and may follow what you said. I'm not worried about the strength of the old 14b, I've never heard of anyone breaking them. But I've already got disk brakes and an e-brake with the 11.5 14b, so I may just sell the gears and locker and keep the 11.5 and regear/lock that.

 

[SmokeShow]

Just know if you push up around 900ft-lb of torque through that NP205 (which you'll do if you make 425rwhp - especially in a loaded up, low rev situation offroad), you're going to bust the case on it. Not if, when.

 

[fl0w3n]

Just know if you push up around 900ft-lb of torque through that NP205 (which you'll do if you make 425rwhp - especially in a loaded up, low rev situation offroad), you're going to bust the case on it. Not if, when.

Wow, I had never heard of people breaking 205 cases. That must be common in sled pulling?