Horsepower Ratings On The 6.0l

[hdeatsprius]

Just wondering if anybody can clue me in on the different power ratings on the 6.0L. I have a 2007 Silverado 2500HD 2WD Ext Cab Long Bed with the 6.0L gas engine. From what I've managed to dig up my truck is only rated at 300 HP. This doesn't seem right. My last truck was a 2006 Silverado 1500 Z71. It had the 5.3 and was rated at 310 HP. I've also noticed that the 6.0 has been rated in other models at 340, 345, 353, and in a couple instances I've seen numbers over 400. Why is the power lowest in the most heavy duty application that engine is used in?? I would think that the 2500HD would have the highest numbers since its designed to tow and haul as its primary job. Any info would be appreciated.

 

----Also if anyone knows how I can achieve those higher numbers, I'm all ears. It seems silly to have an engine like this running way below its potential.

[Woodcutter]

Looks like the 2007 6.0L in a 2500HD is rated at 353 hp @ 5,400rpm and 373 ft.-lbs. of torque @ 4,400. Power ratings seem to increase slightly by year to remain competitive with similar-sized engines from competitors. Nowhere have I seen a 6.0L rated below that of a 5.3L in a given model year.

[Bruce03Silverado]

Looks like the 2007 6.0L in a 2500HD is rated at 353 hp @ 5,400rpm and 373 ft.-lbs. of torque @ 4,400. Power ratings seem to increase slightly by year to remain competitive with similar-sized engines from competitors. Nowhere have I seen a 6.0L rated below that of a 5.3L in a given model year.

 

 

I have a 2007 Classic 2500HD with the 6.0L and 4.10's. My truck is rated at 300hp. My best friend has an 07 Classic 1500 with the 5.3HO which is rated at 310hp. The difference is in the torque. Mine has 360 ft-lbs at 4000rpm while his 1500 has 335 ft-lbs at 4000rpm. The difference is in your torque! Check the stats on the 07 Classics - the 5.3 HO has a higher hp rating than the standard 6.0L. The NBS 6.0 has 353hp.

[Kodiak450]

5.3, 315HP@5200 RPM and 338 ftlbs@4400 RPM - 07-08..... CR, 9.9 to 1

5.3, 310HP@5200 RPM and 335 ftlbs@4000 RPM - 05-06,.....CR, 9.9 to 1 (H.O. version)

6.0, 300HP@4800 RPM and 355 ftlbs@4000 RPM - 99-00,.... CR, 9.4 to 1

6.0, 300HP@4400 RPM and 360 ftlbs@4000 RPM - 01-07,.... CR, 9.4 to 1

6.0, 345HP@5200 RPM and 380 ftlbs@4000 RPM - 06,..........CR, 10.1 to 1 (Vortec Max 6.0)

6.0, 312HP@4400 RPM and 373 ftlbs@4400 RPM - 07-08.... CR, ?.? to 1 (3500 DRW)

6.0, 353HP@5400 RPM and 373 ftlbs@4400 RPM - 07-08.... CR, ?.? to 1 (2500 & 3500 SRW)

6.0, 367HP@5500 RPM and 375 ftlbs@4300 RPM - 07-08.......CR, 10.1 to 1 (Vortec Max 6.0)

6.0, 395HP@6000 RPM and 400 ftlbs@4000 RPM - 07-08.......CR, 10.1 to 1 (LS2 TrailBlazer, 93 octane)

[98silvz71]

Somebody spent some time googling.

[hdeatsprius]

Thanks for all the info. I forgot to mention my 2500HD was a Classic, so it would be the 300hp.

[svensk]

Just fyi, outside of different heads on the aluminum 6.0L trucks the main difference is just tuning. GM really holds the 6L back in stock form. If you just got a custom tune you could expect an extra 30hp easily from your block.