Quick Time

iTrader: (1)

Is #317 heads LS6 or 6.0 Truck heads?

Here is a pic of them
<img src="http://www.quicktimeperformance.com/Cars/LS6Head_small.jpg" alt="" />

Cause if its a 6.0 head I have been mislead big time.

SStrokerAce

iTrader: (2)

if you don't want them, i've been looking for truck heads.

Jay 95WS6

I have a 2001 aluminum headed 6.0 motor on the floor and it has casting# 317 heads on it

Jay

One Monkey

Why you say you where mislead?

<small>[ March 20, 2002, 11:16 AM: Message edited by: One Monkey ]</small>

XtraCajunSS

iTrader: (2)

The 6.0 Liter and LS6 heads are identical except for chamber size. You may want to get more numbers off of them and check with a GM parts counter just to make sure.

I hate to see anyone get F'ed over like that. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

y2khawk

iTrader: (5)

The 317 is a truck head

Yes, it has the same ports as the LS6 head. But the chamber is almost 10cc bigger in the truck head. That's a significant decrease in CR if you expect one and get the other.

There should be a 6.0 cast into the head somewhere. I don't recall where, and the porter has my heads <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

They are distinct casting numbers for 6.0 truck and LS6

Quick Time

iTrader: (1)

These heads are on the car now so I cant pull them. Here are the number i see off the picture.

A inscribed number-9832351 4461229864

Also a H138 next to the valves.

The head porter i bought these from says there LS6 head. What should i beleive. My car traps @113mph so there is something wrong here.

Is it possible that its a LS6 head. I waited 8 months for it. I would assume when they ported it they made sure it was a LS6 head.

y2khawk

iTrader: (5)

lower head in the picture

lower right corner of the top of the head, just outside the valve cover gasket surface.

Says 317

That's a truck head

LS6 can be 799 or 243 i believe

But, if it's got 317 on it it's a 6.0 head.

Unmilled, and you'll be down on CR with stock dimension pistons

Quick Time

iTrader: (1)

Harlan
These heads are stage 2 ported with 2.055/1.60 valves. There are shaved because I have pushrods that come with it. By running this head on a stock 346 block, it would have really no benefit what so ever.
I called the porter and they start that my heads are LS6. Hmm could i have the only 317 cast LS6 heads???? After i fix my tranny im going to dyno it and se how bad this really is.

y2khawk

iTrader: (5)

depending on how much they have been milled, the chamber may now be a moot point.

On a 346 block, there is a big diference running unmilled truck heads. The combustion chamber is bigger, volume and diameter

To run a 6.0 head on a 5.7 bore with no milling requires the use of the 6.0 head gasket. The 5.7 sealing ring would be in the chamber on an unmolested head. Trust me, i have a set of 317 castings at the porter now, no milling involved. And i'm running the 6.0 gaskets with them.

there's a considerable difference in the chamber size for a 4" bore compared to a 3.898" bore.

The marking for what engine the heads belong to is on the underside of the head. If they're installed that makes it tough to check

Here's my old stock heads for reference on where it is. The LS6 will be 5.7 as well. truck heads would have 6.0

<img src="http://harlan.sketchy.net/harlan/headmarking.jpg" alt="" />

If the heads are a 317 casting they are truck heads. Not LS6. The ports may be the same, but the chambers are not. Your porter is flat out lying to you

Now, go kick his *** <img border="0" alt="[judgement]" title="" src="graemlins/gr_judge.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

If you really want confirmation, pull one of the heads.

JPR

Quick Time,
Another "tell tale" way to determine if they are LS6 heads is that there are 4 inverted "V's" on the out board side of the head castings under the exhaust ports. These are destinct marks that are raised off the head casting and also have the "D" styled exhaust runners as well. The only other head that has the inverted "V's" on the castings are the 2001-2002 241 series head and you have neither. I wouldn't really sweat the flow numbers, but the compression would most likely be off a bit? Just to make one thing clear, the 241 castings are not LS6 heads although they share the same external markings, this is GM's new "smooth cast" procedure. And yes, they are 6.0 truck heads that you have.

<small>[ March 20, 2002, 09:56 PM: Message edited by: JPR ]</small>

y2khawk

iTrader: (5)

yep

241's are the better flowing of the 2 truck heads. different casting method, but still bigger chambers.

Quick Time

iTrader: (1)

Thanks for the info Jay, even though its not what I want to hear.

One monkey
I purchased these as LS6 heads not 6.0 heads. That is why i was misled and now F'ed over.

NYNJRacer

iTrader: (7)

Hate to tell ya dude, but those are 6.0 heads. Aluminum Truck heads have LS6 exhaust ports, but different intake ports and larger combustion chambers. LS6 casting numbers are 799 or 243 and LS1s are 853s.. I thought you were supposed to get LS6 heads? You even waited like 8-10 months for these, didn't you, and paid some crazy price for them?? I'm sure you brought this situation to the shops attention before this gets ugly. We all know mistakes happen, which is fine as long as the shop stands by their dealings and rectifies the situation.
Lata
Abe

Quick Time

iTrader: (1)

Got in touch with the porter. Gonna try to work this out. Seems im gonna have to pull them and ship em back. Ill give an update on this soon. Have to attend to the shattered tranny issue.

One Monkey

6.0 heads and LS6 head are not the same except for the Chambers. 6.0 Intake port and LS6 intake port is very diffrent!! guys who are saying this oviously don't know what there are talking about.

y2khawk

iTrader: (5)

OK, how do you know what you're talking about then??

Trust me, they are the same ports.

One Monkey

Hmmmmmm....... Lets see because I ported about 8 sets of truck heads..... 6 sets of LS1 heads. 6 set of LS6 heads and mess with a port on a C5R. oh and I have a set of each one not counting the C5R here right now. I wonder if that gives me some Idea... what you think??

There not the same.

<small>[ March 22, 2002, 04:51 PM: Message edited by: One Monkey ]</small>

Pro Stock John

iTrader: (34)

Brett, more info please.

Did you port those heads for SAM?

One Monkey

John No not for the school.... The C5R head I had the pleasure of checking out was there. but I have never done any of Judsons stuff. direct!! All the heads I have done so far was for street racers the 6.0 heads I have done alot of research on.

<small>[ March 22, 2002, 04:55 PM: Message edited by: One Monkey ]</small>