mikey

iTrader: (6)

I hear that they are similar in port design to the LS6 head. Any truth to that?

Jayson - MTI? Nick?

Trevor @ Texas Speed & Perf.

iTrader: (3)

I was told that they are similar by a student of Judson's that is now porting heads. I was also told that Judson has started using them as well. I'm sorry that I can't give you any specifics on them, but I thought I'd at least share the word on the street. <img src="gr_images/icons/wink.gif" border="0">

LS1derfull

2002 Cadillac Escalade has LS6 heads on its 4wd 6.0 litre that is one of the ways they are getting 345HP out of it. <img src="gr_images/icons/wink.gif" border="0">

99 Black Bird T/A

iTrader: (4)

I was told the exhaust port is like the LS6, the intake port is actually better than the LS6 but the chambers are bigger on the truck head. (01 and 02 something like 76cc or 72cc I can't remember so) The 6.0 truck head is said to drop the compression below the stock level unless the head is decked. I don't know how much they have to be decked I want to say about .030 will keep the compression about the same as the stock LS1 head. I haven't been able to confirm any of the above.

I do know TEA had an LS1 with the LS1 intake dyno 420rwhp using the 6.0 heads on one of their heads and cam packages using Mac headers. I was very impressed, and would like to know more.

FlamingTA

iTrader: (8)

Mikey, I emailed you a while back and never got an answer. I was wondering what fuel system you were using with that 9.51 pass? I am having an engine built by Nick and need a fuel system to feed alot of HP. BTW, when I spoke to nick about heads I ask him about the 6.0 heads and pretty much recommended them. He had a lot of sets around there. For my iron block 427 I'm getting some 6.0 stage 3 heads.

Jantzer98SS

iTrader: (54)

I know the 99 6.0 heads are cast iron and are the same port desegin as the LS1 casting. The 00 heads are aluminum and I think have the same intake port as the LS1, but the exaust is the same as the LS6 (D port). And the 00 heads I'm pretty sure are just 2 cc larger than the LS1 heads. Of course the 4.8/5.3 heads are smaller chamber heads but don't have LS6 intake or exaust ports. If I can find what each of the chambers are, I'll post.

If the 00/01 6.0 heads are indeed LS6 castings with larger chambers, it might be worth having a set welded up to get the compression back up.

LS1derfull

JANTZER, no not 00-01 but 2002 6.0 Escalade 4wd only has LS6 heads.This is exclusive to this model only, not other GM 6.0 trucks.

-Joseph-

iTrader: (12)

The GM part numbers are the same between the LQ4 (300hp) and the LQ9 (345hp) engine cylinder heads. I've heard from a very reliable source that the port configuration is the same as the LS6 heads, its just made for the bigger 6.0L engine bore.
I haven't measured the combustion chambers myself, but I remember 70cc's being the number the truck heads are supposed to be.
The only mechanical difference I've found between the two aluminum headed 6.0L's was the pistons...The Escalade 6.0L (LQ9) has Hypereutectic Flattops (10-1 compression) whereas the LQ4 has dished cast aluminum pistons (9.4-1 compression)

Sporadic

[quote]Originally posted by 99 Black Bird T/A:
<strong>I was told the exhaust port is like the LS6, the intake port is actually better than the LS6 but the chambers are bigger on the truck head. (01 and 02 something like 76cc or 72cc I can't remember so) The 6.0 truck head is said to drop the compression below the stock level unless the head is decked. I don't know how much they have to be decked I want to say about .030 will keep the compression about the same as the stock LS1 head. I haven't been able to confirm any of the above.

I do know TEA had an LS1 with the LS1 intake dyno 420rwhp using the 6.0 heads on one of their heads and cam packages using Mac headers. I was very impressed, and would like to know more.</strong><hr></blockquote>

That would be my car that has TEA 6.0L heads and made 420 rwhp. I do have FLPs, but just a stock intake.

The 6.0L heads do have the same intake and exhaust ports as the LS6 heads, only difference being the larger chambers. I talked to Brian Tooley at TEA last weekend and he's done a few LS6 heads lately and he can't get the same mid range flow numbers out of them as the 6.0L. He says the larger chambers of the 6.0L heads unshrouds the intake valves more. My heads were milled 0.030" and the chambers measured 63cc afterwards.

I don't understand why more people don't use these heads more often especially on the built motors. If you have to put different pistons in, you can easily make up the lost compression. $400 for the 6.0L cores, $1000 for the LS6 cores... Hmmm... I guess I just don't understand. Come on 9ball, prove my point on your new motor. The $600 savings would just about pay for a good set of Jesel rockers. <img src="gr_grin.gif" border="0">

Matt

[ January 27, 2002: Message edited by: Sporadic ]</p>

FlamingTA

iTrader: (8)

I will see how the 6.0 stage 3+ heads do on my ARE 425 motor. Should do pretty good I think. The only thing that will throw off my numbers is the fact that my heads and motor are going to built for nitrous not NA.

One Monkey

The heads intake port is not the same as the LS6 head. It diffrent than bouth the LS1 and the LS6.

BlownC5

iTrader: (81)

They are the same! Come to my shop and I'll show you. 317 & 799 casting numbers use the same intake and exhaust corebox tooling. Hope this helps. <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />

racer7088

Having seen several sets myself they are not the same as an LS6 as One Monkey says. They are close but have several differences. The intake port is also larger than an LS6 too which isn't necesarrily good.

blackhawk2000

I know a secret about these heads, but I'm not at liberty to tell at this time <img src="gr_images/icons/wink.gif" border="0">

I can tell you they flow better than LS6 heads. There are 2 castings. one flows better than the other. Something about the casting process. Now after you port them both they may flow the same. I haven't heard if it's just casting flash, or casting surface, or a slight design change that makes one flow more than the other yet. They have a larger chamber than the LS6's. About 1/2 point in compression drop from LS6's, but the LS6 is a half point higher than the LS1. This is from a very reliable source.