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Old 07-15-2017, 04:17 PM   #16
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Re: Mystery LS1

I got this # from the back left head 1305mk579365 does any one have info on this 3
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Old 07-15-2017, 04:58 PM   #17
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Re: Mystery LS1

Quote:
question would not larger injectors cause the ecm pull fuel back?
a friend said I had LS6 injectors, he had just put the larger injectors in his car so I believe him
If you installed larger injectors (the LS1 and LS6 both used the same size 28.6 #/HR @ 58 PSI injectors 2001-2002), the only way the PCM would have to pull out fuel would be if you didn't have the PCM programmed with the larger injector size. That would be a serious mistake. Larger injectors do nothing, unless the amount of air entering the engine is increased - better heads/intake, more aggressive camshaft, etc. Then the engine needs more fuel.


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I had a firebird 2002 owner look at the engine and listen and said they are not the same.
Of course they are not the same. A 2002 Firebird Formula or Trans Am would have the "base" 310 HP LS1. You have the 345 HP SLP package. On the other hand, if the Firebird was a Firehawk, it would have the same SLP package as the SS.


Quote:
both gm and slp deny it
What exactly does that mean? Does SLP acknowledge that your vehicle is in fact 2002 SS conversion #138, based on the serial number you would have to give them? Are they denying that they ever modified the vehicle in any way other than the standard 345 HP package? Whom did you contact at GM to attempt to verify the vehicle is something other than a 345 HP SLP SS conversion?

Since Roush bought SLP in 2013, finding out about specific vehicles has become a bit more difficult. But the founder of SLP, Ed Hamburger, is still available. He now operates HSV (Hamburger Specialty Vehicles). You might want to contact him there, and see if he can shed some light on your search. There were always rumors that the LS6 would be installed on some of the final year 2002 F-Bodies, but all the references I have seen indicate it never happened.

About Us | Hamburger's Specialty Vehicles

A decent reference on the last years of the LS1 in the F-Body, with regard to part #'s, injector sizes, performance mods:

Amazon Amazon
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Old 07-15-2017, 05:12 PM   #18
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Re: Mystery LS1

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Originally Posted by mystic27 View Post
I got this # from the back left head 1305mk579365 does any one have info on this 3
Part #'s:

LS1 - 12564241

LS6 - 12564243

Look at the exhaust manifold side of the head. On top of the rectangular edge that forms the face of the exhaust ports, there should be a three-digit number cast. Either 241, 243 or 799. Go to this eBay listing, and hover the mouse over the photo of the heads. When the photo enlarges, move the mouse down to the bottom of the picture, the head on the right. You will see the "241" location. Appears to be right above a number with the same number of digits you quoted, but not the same number. That may be a production date code.


LS1 LS2 LS6 241 CYLINDER HEADS GM OEM CORVETTE TRANS AM CAMARO GTO | eBay
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Old 07-15-2017, 08:52 PM   #19
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Re: Mystery LS1

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Originally Posted by Injuneer View Post
In 2002, some LS1's in the F-Body got the LS6 block, which just has larger windows in the webs between the cylinders. Some of them also got the LS6 intake manifold.
Correct about the block, but not the intake.

All 2001 and up LS1s, regardless of the car they went in, got the LS6 intake. It was paired with a slightly milder cam, and a +5hp rating relative to the 2000 model. (305->310 for Z28s and Trans Ams; 320->325 for SSes and WS6s, 345->350 for C5s).

It also makes the engine a bit more tractable in the very low RPM range. For example, my 2002 is perfectly happy to loaf along at 40mph in 6th gear, running just 800rpm. The earlier cars will lug if you try that.
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Old 07-16-2017, 01:06 AM   #20
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Re: Mystery LS1

thanks for all your help all of you
I could not do that stunt 800 rpm in 6th gear at 40 mph it would protest loudly.
any thing below a 1000 it would complain.
my friend who had a transam had headers 3 inch exhaust and a forched air induction, that was not one I seem before fed diretly to a huge 12x14 filter.


I won,t bother asking questions any more for a while
BTW the fuel filter change definetly help the high rpm running.
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Old 07-26-2017, 11:25 AM   #21
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Re: Mystery LS1

there is a new mystery as it appears not to have no rev limit,
in low gear when having fun the car got away from me, it spun up to 6400 rpm before I caught it . does not the ls1 have a rpm shut off of 6200 rpm?
and at 6400 it was charging for more it did not even try to stop reving
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Old 07-27-2017, 06:59 PM   #22
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Re: Mystery LS1

does the f bodies have a factory drive shaft hoop installed at the factory?
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Old 07-28-2017, 08:57 AM   #23
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Re: Mystery LS1

Not sure what you mean by a hoop, and where it is located on the drive shaft, but on my 95 Z I had a Propeller Shaft Slip Yoke, see the Photo. I had it removed, and the drive shaft rebalanced along with new U Joints when I replaced the Transmission Ouput Seal and the Rear End Pinion Seal.
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Mystery LS1-100_2867.jpg   Mystery LS1-100_2820.jpg  

Last edited by gaedbo; 07-28-2017 at 10:03 PM.
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Old 07-28-2017, 03:11 PM   #24
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Re: Mystery LS1

I think he means driveshaft safety "loop"......

https://www.bmrsuspension.com/?page=...3CB6AA946E7E2F

Never installed at the factory. There is just a sheet metal brace across the bottom of the driveshaft tunnel, where the red cross-support is in the photo below.
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Old 07-28-2017, 05:47 PM   #25
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Re: Mystery LS1

Thanks Injuneer, I wasn't aware of this.
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Old 08-23-2017, 11:34 PM   #26
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Re: Mystery LS1

I have yet dynoed the car [ plans for future ]. I have determine the harmonic balancer is aluminum. the# at the back of the block on driver side is 1305MK579365.
those last 6# have no common relation to the last # on the vin, and any thing else is subjective, yes I had a try at 0-30 but was tire limited.
is it really true hood , tailgate,doors , roll bar and front fenders, are made of aluminum or fiberglass.
thanks
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Old 08-24-2017, 12:08 AM   #27
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Re: Mystery LS1

On an SS, everything but the rear fenders is composite plastic. A Z28 would have a steel hood.
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Old 09-07-2017, 11:38 PM   #28
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Re: Mystery LS1

does any one know what head this is 12561584
there is symbole of { I } under that #
and also { gm }
and also { dp }
and a large 7
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Old 09-08-2017, 11:01 AM   #29
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Re: Mystery LS1

GM parts houses show that as a power steering mounting bracket, not a head.

https://www.gmpartsdirect.com/oem-pa...Mjc1NSZyPTI%3D
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Old 09-08-2017, 09:56 PM   #30
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Re: Mystery LS1

sorry for being dumb, I should of look closer.
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