2014 rules posted

Questions and answers about CMC and NASA rules

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Glenn
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Postby Glenn » Mon Nov 18, 2013 11:39 am

LS1 and LS6 are the same. You may be thinking of LS2/3.
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Supercharged111
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Postby Supercharged111 » Mon Nov 18, 2013 11:42 am

Nope, LS6 uses raised floors and different shapes than the LS1. LS2 heads are straight up LS6 heads with solid valves (casting number 799) and some LS2 even got LS6 castings (243). Some cars have one of each! I guess they were just using what was left. LS1/2/6 are all cathedral ports, but not all cathedral ports are created equal.

http://www.c5registry.com/documents/ls6/page2.htm
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Glenn
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Postby Glenn » Mon Nov 18, 2013 11:47 am

LS1/6 only ran through 02 for the f-body. Those have always been legal. Those are the same heads found on the legal truck motors. No major port changes until the LS2/3 motors. None of those are legal.
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Supercharged111
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Postby Supercharged111 » Mon Nov 18, 2013 12:01 pm

Glenn wrote:LS1/6 only ran through 02 for the f-body. Those have always been legal. Those are the same heads found on the legal truck motors. No major port changes until the LS2/3 motors. None of those are legal.


The LS6 has very different ports than the LS1. Also, the LS6 never came in the f-body, but 01-02 f-bodies did get the LS6 intake manifold and some lucky recipients even got the better breathing block (less blowby).

Image

I realize by limiting the years, you're avoiding an LS6/2 based head, but I did a little digging and found that the L33 does in fact use an LS6 based head. It's kind of a moot point though because the restrictor plate will just get smaller to kill those gains. Make no mistake though, the LS6 and LS6 based ports are superior to the LS1 ports and the LS2 ports are unmodified LS6 ports.
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Glenn
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Postby Glenn » Mon Nov 18, 2013 12:21 pm

Ok - my bad on the LS2.

LS6 did come in 4th gens, just listed on the window sticker. As production came to an end, GM put what they had in the f-body. Plenty of documentation on this. LS6 heads, intakes and in some instances blocks as well were used for 4th gens.
If you go to GM and ask for a head or block for the LS1 4th gen, you will get LS6 parts.

So I don't see your point. All LS6 parts have been legal since the LS was legalized. If the truck came with those parts, what is the issue? They were already legal.

And I don't call the difference betwen LS1 and LS6 heads a major difference. Most all the platforms have these differences throughout the life of the platform generation.
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Supercharged111
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Postby Supercharged111 » Mon Nov 18, 2013 1:19 pm

I think I got hung up on what I perceived as the intent of limiting the years and RPOs of the engines to use as not allowing LS6 ports based on what I'd read. That and the LS1/2/6 differences. And the L33 being an 05-06 motor, but that's an easy fix to the rules by expanding the years to 99-06. AFAIK, the Intimidator was the only Camaro to receive the LS6. I forget which Pontiac got it.
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Supercharged111
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Postby Supercharged111 » Mon Nov 18, 2013 1:50 pm

Supercharged111 wrote:Can the collars front and rear be set where we please now for cornerweighting? Last I checked, I was within 40# so I probably won't screw with it but it's nice to know you can.


Per Al's other thread, the answer is yes.

http://www.camaromustangchallenge.com/f ... php?t=4513

Al Fernandez wrote:Approved changes for 2014
RCR#3, 7 in favor, 1 against: Everyone can now employ adjustable spring perches to make it easier to corner weigh the car. There are limits as to this; no modifying the front arms or the chassis. We allowed modifications to the rear Ford arms for this because rear aftermarket arms were already allowed.
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supermac
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Postby supermac » Wed Nov 20, 2013 2:26 pm

I have always been under the impression that the 243 head was not legal in CMC? Nor the "LS6" intake?

JJKJ
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Postby JJKJ » Wed Nov 20, 2013 3:05 pm

supermac wrote:I have always been under the impression that the 243 head was not legal in CMC? Nor the "LS6" intake?


All 2001+ LS1's have the LS6 intake stock.

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Postby supermac » Thu Nov 21, 2013 6:44 am

Functionally maybe, visually no. I have held both in my hand and they look different.

Den34
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Postby Den34 » Thu Nov 21, 2013 7:33 am

You could have a FAST aftermarket intake or the latest superfast intake but the air would still have to pass through a 47 or 48mm restrictor plate.
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Steve91T
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Postby Steve91T » Thu Nov 21, 2013 7:35 am

Does anyone know when a detailed write up of a 5.3 in a 4th gen will come out? I'm also anxious to see some videos of how this thing sounds at full song.

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cozog
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Postby cozog » Thu Nov 21, 2013 7:38 am

Steve91T wrote:Does anyone know when a detailed write up of a 5.3 in a 4th gen will come out? I'm also anxious to see some videos of how this thing sounds at full song.


PM Bob Denton (den34?). He ran 5.3 all last year.
Todd Johnston, #59

Steve91T
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Postby Steve91T » Thu Nov 21, 2013 7:45 am

cozog wrote:
Steve91T wrote:Does anyone know when a detailed write up of a 5.3 in a 4th gen will come out? I'm also anxious to see some videos of how this thing sounds at full song.


PM Bob Denton (den34?). He ran 5.3 all last year.


Yeah I know. I don't want to bug him just because I'm inpatient. Just wondering when he was going to post his results.

Den34
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Postby Den34 » Thu Nov 21, 2013 8:55 am

What exactly are you looking for? Video? Dyno sheets?
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