6500 redline 6400 shift on the 5.3 stock bottom

6600 shift and redline on the 6.0 arp2000 bolts only

ive seen guys arround here saying they have spun it even more to 6800-7000 rpms

 

And their engines last what, 3000 miles tops? Even custom built engines can't reliably spin that fast.

The highest SAFE RPM limit on a stock 5.3 is 6400RPM. A 6.0 is 6200RPM. At those speeds you should be bouncing off the rev limiter...not shifting! Shift speeds should be at least 300RPM below the limiter.

ARP bolts don't mean diddly over 6200RPM. The crank itself isn't balanced to go past that speed, which is most likely why yours died. The sheer harmonics of shifting at 6400rpm and sustaining that RPM is probably enough to physically crush the crank bearings and cause early failure.

No amount of oil or pressure will make an engine live longer under such conditions. If you've got money to burn and more money growing on the tree in the backyard...then yeah, you can blow up as many as you want. But I suspect you don't want to be blowing them up very frequently, yes?

 

You are kidding right. I ran my stock 5.3 to 6800 rpm. It was sc from 70k-120k. Tc from 120k-200k. It went lean and popped a piston. Everything else was fine in the engine.

 

every buddy has an experince , I didnt and dont plan to blow any engine .
I actually was planing on boosting the 5.3 and then the 6.0 and after I blew them , I sai what the hell , let get some bottom end with a 4" crank

as of spinning engines high

some camed LS3's rev to 7200rpm , on completly stock bottom end.

and on my 6.0 , it only died after abad tune , not from reving

it survived for 15k miles , and throwing flames on 3rd when hitting the rev limiter because I was running rich A/F arround 9.5:1 lol

 

GM has a TSB about using the AFM high volume oil pump draining the oil pan faster than the oil can return to the pan.

As for turing the engine RPM 6200+ is the cam your using still making power at that RPM? Most cams are loossing power at this point.

 

If you want to spin it, go for it. You've been exceedingly lucky thus far, maybe it will hold up in the future too. I've heard of turbocharged 4.8L engines doing 8500+, but I just can't recommend running at that RPM.

 

62-6800 rpms is pretty common on these trucks. Even mail order tunes have 6400 rpm shifts.

 

Arn't you still running a tvs blower ? What is then need to spin it that hard? A stock GM pump will flow plenty. I have seen more high volume pumps wipe engines out then stock ones.

 

They might shift at those speeds, but I doubt the tuner intended the truck to be running at those speeds continuously.

Maybe we could get one of the professional tuners on here to chime in?

 

True story, myself included