775 hp isn't the problem....
A Factory aluminum block the bores may start moving...Cement needed, wink, wink.
The crank may or should hold....8 ccw crank by the factory in the 6.6 runs about $700.00.
Believe it's forged, and helps with Bearing wear with Hi rpm applications

 

Example of your thought.... This guy brought my Dumb ass A long Way...

376" LS3 build... kind of surprised me

Over the past several months I've been working in my spare time putting together an LS3 out of mostly spare parts. Basically seeing what I could do on a budget. Used a stock block, stock crank, used rods, small dome piston, stock casting heads, and 455 lobe nitrous grind cam. Ported on the...

www.yellowbullet.com

 

Stock, not a chance. It's not the hp, it's the rpm. You need some really nice rods and at least a stock forged LSA crank to even try it. Pistons need to be really good and light, too. I am accumulating parts for 8500+rpm build and it's a big jump in strength/quality once you go over 8000rpm.

 

Any links to details surrounding 8K + failures?

 

I got pics on my phone of a road race LS3 that went from 6th to 3rd, lol. Nothing was saveable except one head and the intake manifold. I look at it this way, for a few dollars more, get an LSA crank and worry less. In an SBE situation, usually something' else fails first like a wrist pin. That stretch from 8000rpm to 9000rpm has a lot of math attached to it and everything gets real heavy, real quick. The stock cast cranks hang in there, but they do flex. Maybe 63Corvette will chime in, I believe his mule is a SBE LS3 that get spun real hard. The stock LS stuff is real good, but 9000rpm is a lot. Making the rod/piston superlight is another option, but I don't think you can go light enough w/o compromising strength to get there.

 

Not saying it’ll last forever, but it has been done before.

 

^GPI got it going on. That's Ryan Steven's engine, he runs GPI. He went 8.5 on motor.

 

Crankshaft isn’t the weak point. But there is no sense in using a stock crankshaft unless rules restrict you to it.

 

If you can get 60k out of a factory bottom end turning 8800 RPM, that’s good.

 

He built it SBE on purpose but his new motor is all forged.

 

What does SBE mean?

 

Stock bottom end.... stock block, crank, rods, pistons, rings, bearings