what is the hp limit on a stock lb7 crank

[jgt1982]

What kind of hp have you guys seen on the stock crank for the lb7

 

[Dirtymaxx03]

A shit ton

 

[Cknight199]

It could break stock, or at 1000 hp. Read up in the thread titled "cranks" ALOT of good info there

 

[jgt1982]

Thanks I will look in to that

 

[Jackblack99]

My truck was stock other than efi tuned, raptor pump and dual disc clutch and it broke a crank.

 

[jgt1982]

Well I am in the middle of a full build and the goal is 800hp and I am thinking with everything I have already done to this thing do i need to just go on and call guy and put a crank in it and be done with it all or what

 

[Cknight199]

What's all in the build? Did you key the crank and cam?

 

[jgt1982]

Well i am doing fingers piston ,duel MP3 ,Carl push rods con rods,fleece s366 arp main head studs Carl springs and porting the heads

 

[Jackblack99]

Carl push rods, connecting rods and springs?

 

[Hot COCOAL]

The hp limit on the lb7 crank is......


1hp les than what you had when it broke

It's a crapshoot, good luck:hug: failure isn't all that common, although it does happen, it's happened at all different power levels at all different load demands. I think that has been the conundrum, there has been no constant, no similarity other than breaking near the #1 journal, that seems to be a pretty common failure point, but, it's happened to guys with the cruise set on the highway, hell, it's happened to stock trucks with less than 50k miles....

 

[PACougar]

9.7

 

[jgt1982]

thanks for all the input guys I just got off the phone with guy at socal and I think we are going to leave it stock and do everything we can do to keep it from breaking and go with it thank for the help

 

[mike diesel]

Billet cranks still break. You need to look into a revised firing order cam shaft..seems to prevent broken cranks.

 

[jgt1982]

that's funny because we talk about them

 

[x MadMAX DIESEL]

I wouldnt buy any type of crank cure, maybe a different fire order cam depending on price! Situation is to little of a risk to spend a ton of money on, but to big of a price for such a little risk.

 

[x MadMAX DIESEL]

As far as billet cranks, that type of stuff I mean.