Whats engine redline for the 6.0L?

moregrip · February 28, 2004

I'm setting up my new g-tech pro competition and have no idea what the engine redline is......anyone happen to know this?

gave20 · February 28, 2004

there is no redline on the tach but I think its around 5500 the highest mine ever shifted was 5K.

MrQuadrasteer · February 29, 2004

Mine seems to consisently shift at 5k (but I thought I saw 51 today ), but the dyno owner ran it to 5700 !!! T/M bad ....

Shaners · February 29, 2004

I've seen low 5's when towing....

gave20 · February 29, 2004

WOW! I hit 5k once and I started to cringe. I just kept think shift dang it! Shaners- 5K when towing were you trying out for the Quaker State commercial. I don't just baby my truck compared to you guys I nurse, pamper and caress it, it's a wonder I don't pull it around. But you are a testiment to GM longevity

PewterC3 · February 29, 2004

My C3 with Wester's tune shifts at 5600.

QUIKAG · March 1, 2004

The 6.0L is an LS1 based motor. The 4L80 transmission is pretty low-shifting with the big torque converter and stock programming, but I think the motor could rev out to 6000rpm reliably no problem. You guys that are getting worried about the engine running up to 5k rpm towing a heavy load make me laugh. Keep good oil in it and warm it up before running it and then spank the sucker.

silverado4800 · March 1, 2004

Like QUIKAG says, these newer ls1 motors will take alot of rpm. They have a pretty stout bottom end. Above 6000 i might get worried as the valvetrain on the trucks in not the same as the camaros or corvette. I will say after 5500 it does start to sounded very wicked. But i run it up that high at least every other day. I put my shift points at 5650 in first and 5850 in second.

Colorado Kid · March 1, 2004

My spec sheet for Model Year 2002 Sierra shows the 6.0L, "Maximum engine speed (RPM) -w/ manual transmission" as 5600 RPM and, ". . . w/automatic transmission" as 6000 RPM , with the following footnote reffering to the automatic tranmission versions. "Maximum RPM 5900 with optional Electronic Traction Control (ETC)."

QUIKAG · March 1, 2004

Yeah, the only problem with rpm I can see would be the valve springs and possible valve float. Anything under 6000rpm, with some good oil and good operating temperatures, you could probably sit at 5000rpm for a long time with no ill effects on the motor.

I keep the LS1 in my '01 C5 above 4000rpm and close to 6000rpm for a long time at full throttle for 30 minute sessions when I'm roadracing. Oil temps get close to 300 degrees and the motor just sings all day long with the Mobil 1 synthetic.

These are stout motors, they like revs to build power.