LB7 Crank choice

[MeanDmax]

So I'm about ready to key my crank for an LB7 build, I don't want to spend the $5000 for a billet crank. I have a low mileage under 100000mi crank, should I use it or buy a brand new GM crank for $900. Is a seasoned crank provend and a better choice than a new crank or ?? I'm leaning towards the new GM crank but a liitle unsure. Last thing I want to do is spend $2000 on block only to have a crank break for no real reason. Any input? If a billet crank was 2500 than maybe, but 5+ well......

Pile of parts in my shop currently are,
Carrillo's
Billet main caps
Socal Girdle
PPE/Mahle .020 new pistons with reliefs
Head studs, Main studs
Socal springs
Socal pushrods
PPE Manifolds
New Exergy 60 overs
And all Bearings, studs, etc for the usual build.
Dual pumps, stock LB7 with LBZ 2nd pump
Using my old turbo for now S471.

I probably would only switch to an S475 someday so is a cam going to make much diff or not. Being built for driving and playing, nothing serious.

 

[dieseladdiction23]

subd

 

[dansdieselp]

Stock LB7 and LLY cranks hold up well. That mileage is fine. Just have it magnifluxed and balanced.

 

[AubleAK]

Think its kind of hit or miss on cranks..

 

[WVRigrat05]

The crank in my truck came out of an LB7 with a pile of miles, 34k miles on the motor now, and its been wound tight since day 1.

 

[Chevy1925]

It's a "6 in one hand, half dozen the other" type deal. I reusedy crank with 165k on it. It's help up to 750hp well so far and gets hammered on a 550+ tune daily

 

[dieseladdiction23]

not to hijack his thread, but is a billet crank the only other option. ive heard alot about the lb7 cranks breaking and was worried about building a motor with one in it

 

[jkholder09]

Seasoned cranks are my preference.
Definately mag it.

 

[adeso]

I went with a seasoned crank that has been mag tested

 

[hondarider552]

My crank in my built engine has ~50k on it, so we shall see.

 

[blk smoke lb7]

The LB7 crank is rumered to be stronger,mine had 150,000 on it and i built the motor with it and no problems at this time.

 

[MeanDmax]

So with the comments I have decided to go with the used LB7 crank, has anyone had any experiance with cryoing a crank, a local place does tones of engine parts, but has never done a diesel crank. I've heard diff opinions but have any of you guys had one done? I think I know the answer but ???