Can anyone suggest a good source for general info on GM LS1 based truck engines, specifically the 6.0L. What are the hp ratings? which heads, cams, intakes are used? Why does the denali have more hp? What are the yr. model diffs?

 

http://www.gm.com/automotive/gmpowertrain/engines/vortec/apps/vehicle/vortec6000_ho.htm there is some basic engine on the 6.0L engines, also the 4.8 and 5.3s

not sure about the denali (forgot what hp rating it is) but the escalade with the LQ9 gets most of its added power from its 10:1 compression ratio that it gets from flat top pistons compared to the LQ4s 9.4:1.

all of the trucks use the same intake, which flows better than an ls1 intake and flows nearly as good as the ls6 intake.

they(6.0Ls) have their own D-port heads (i believe some of the earlier heads were cast iron though, like 99-00) these heads are the same design as the ls6 heads and flow quite well. obviously a larger combustion chamber than the 5.7 or 5.3L heads

as far as mods... the mods between the 4.8L and 5.3L are interchangable with the 6.0L and almost all of the mods for the 5.7 will bolt up (with the exception of those that wont because of the way they fit on either). they take the same crankshafts/camshafts internals (minus pistons) as the 5.3L and 5.7L as well, with the 4.8L having a smaller stroke

i'm not sure about differences in HP between the years on 6.0Ls though. as far as 5.3Ls the 99s were weaker than the rest with pretty crappy top ends, as were the 4.8Ls. the 2001s are faster than the 2000 or belows from what i have seen (not sure if this is the same on 6.0Ls though)

hope this helps,
Bryan

<small>[ September 16, 2002, 11:32 PM: Message edited by: really slow truck ]</small>

 

i have the deanali 6.0, i was told the extra HP is just rating skeem, they just rate it at a slightly higher rpm to give it higher numbers.

that makes for 3 diferent 6.0's

99-00 iron heads
01-02 aluminum heads 9.2-1 CR
escalade aluminum heads 10-1

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by parish8:
<strong>i have the deanali 6.0, i was told the extra HP is just rating skeem, they just rate it at a slightly higher rpm to give it higher numbers.

that makes for 3 diferent 6.0's

99-00 iron heads
01-02 aluminum heads 9.2-1 CR
escalade aluminum heads 10-1</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The escalade heads are the same as all the 6.0L heads 01-newer. The escalade gets its extra power from the flat top pistons as opposed to the dished pistons on the other 6.0L's.

 

I heard when the Escalade first came out that the extra power was from different heads. I thought that I had seen somewhere that there was a short run of Escalades with different casting # heads and that they are EXTREMELY rare (like a hundred or so?)

Can anyone confirm/deny this? Can't remember where I read it now....

 

Just found this in a press release from Cadillac about the new Escalade ESV...

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">The confidence of class-leading power and all-wheel-drive

more horsepower, more torque than any SUV
The best-in-class Vortec 6000 gives the AWD Escalade more horsepower and torque per liter than any SUV, at 345 hp at 5200 rpm and 380 lb-ft of torque at 4000 rpm. The high-compression engine delivers strong acceleration with impressive low-end power and a strong, flat torque curve for excellent pull throughout the rev range. It links to the Hydra-Matic 4L60-E HD (heavy-duty) electronically controlled four-speed automatic transmission with overdrive.

The key to the 6.0L's increased output is a set of special cast-aluminum cylinder heads that reduce weight, aid in engine cooling, produce a 10:1 compression ratio and provide better airflow in and out of the combustion chambers via bigger intake and exhaust ports. A larger, 75mm throttle-body and a revised camshaft profile allow the engine to take full advantage of the increased airflow. The Vortec 6000 also incorporates an advanced Electronic Throttle Control (ETC) system, which precisely tailors throttle progression to improve driveability, fuel economy and emissions. A specially tuned, less-restrictive exhaust with a redesigned catalytic converter system not only increases performance, but also eliminates the need for an Air Injection Reaction system and helps Escalade ESV meet ultra low emissions vehicle (ULEV) certification requirements in California and other states with similar laws.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The entire press release is at http://media.gm.com/division/2003_pr...de_esv_pr.html

 

does anybody know the part number to these escalade heads?

i remember when jason98ta was building his truck engine a while back they went to the dealer and picked up a set of escalade high compression pistons. maybe the heads are milled a little too <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

 

no surprise. im guessing they released that information, then afterwards decided it would be much more cost effective to keep the same heads and assemble the engine with flat top pistons. (i think it would be cheaper at least...)

either that or they are in fact just bs'ing. i am still curious as to what an escalade puts out as far as power to the ground with the rated 345hp.

 

well, I here's another interesting tidbit...

I just called my friendly GMC parts man (probably the best parts man in NE FL) and he shows only one part number for 6.0L heads--12562319. That's for the LQ4 and LQ9 motors.

I guess that Cadillac is BS'ing the general public on this one?!?!? Now I'm confused....