1994 LT1 Intake Manifold Casting Number

[Joe L.]

Re: 1994 LT1 Intake Manifold Casting Number

All------


I think it's like this as far as LT1 intake manifold casting numbers go:

1992-93------ GM #10108476

1994-96-------- GM #10108630

[Bill L.]

Re: 1994 LT1 Intake Manifold Casting Number

Thanks Joe:

That has been my observation as well.

Regards
Bill

[Bill L.]

Intakes.png

[Pat F.]

Re: 1994 LT1 Intake Manifold Casting Number

Folks, found some more information re the LT4 Intake Manifolds. Information on the internet stated as follows" The LT4 number 12550630 and 12550631 have identical numbers to the late model LT1 12552137 and 12552138, but has more material above the runners so that it will seat properly with the LT4 Heads".

I am offering this for what is worth. Jim you have one of the references 12552138 and Pat you have anothe of the references 12550631, neither one of these is listed in the 94-96 Judging Manual.

I do not know the basis of the information contained in the Judging Manual but I will attempt to summarize our findings and submit them to Tom Barr.

Additionaly, it was pointed out that a referenced intake manifold number of 10128327 for the 94, 95 LT1 and the 96 LT4 is also a documented number for the water pump.

Once again I will try and summarize this information and send it along to Tom Barr.

Any other information from other members would be greatly appreciated.

Thanks

[Pat F.]

Re: 1994 LT1 Intake Manifold Casting Number

Folks, here is the entire statement I referenced earlier.

LT1 vs LT4 Intake Manifold Differences

The LT4 intake (12550630 or 12550631) hasidentical runners to the late model LT1 intake (12552137 or 12552138)
but has more material above the runners so that it will seat properly with theLT4 heads. The extra material
over the port is to seal the smaller LT1 intake ports to the larger LT4 headports. Additionally, LT4 intakes were
powder coated RED from the factory. These are the only significant differencesbetween the two intakes.

Note, however, that the LT4 manifold will NOT fit LT1 heads. They will bolt up,but the ports will not match
and there will be interference with the valve cover gasket rail on the LT1head.

[Pat M.]

Re: 1994 LT1 Intake Manifold Casting Number

Charlie, thank you for your efforts on this, and all the other late C4 matters you've investigated and reported.

[David L.]

Re: 1994 LT1 Intake Manifold Casting Number

I have a 1994 Camaro Z28 with LT1 and MM6 (6 spd. M.T.). The intake has a casting number of "10108630" and is stamped "MADE IN USA AC ROCHESTER", "17094047", "0784", "KMK", and "1" on the top surface. I am quite confident that the "0784" stamping is a date code for the 78th day of 1994 (March 19, 1994).

[Pat F.]

Re: 1994 LT1 Intake Manifold Casting Number

Folks, first question to the LT4 individuals.

Did you locate you intake manifold number after removing the right side fuel rail cover?

I have agree that there is some confusion with the numbers in the Judging Manual and what the LT4 guys have reported. We Lt1 guys have it right, at least for our intake manifold number.

In reviewing the Chevrolet Parts Book in relation to the LT4 and LT1 intakes, it states that the 94-96 LT1 has a number of 12552137. Refer to my earlier post and this number was shown for the late LT1.
The Parts Book also showed for the 96 LT4 a number of 12550630, also refer to the earlier post and it shows up for the LT4.

Now we know that their is a difference for the LT1 as we have reported it as 10108630. So why the different number in the parts book? I have go back through my stuff and get an article by a well posting member who explained the difference between the parts book number is sometimes different than the number on the actual part. Also the difference with a service part number.

We all are in agreement that there is confusion with the Judging Manual, but LT4 guys please let me know if you found your intake manifold number under the right fuel rail.

Thanks for your help.

Pat, thanks for your kind words, we are all in this together and if we can help one another out, we all come out ahead.

[Pat F.]

Re: 1994 LT1 Intake Manifold Casting Number

What I am saying in a nutshell is that the LT1 guys are reporting intake casting numbers and the LT4 guys are reporting Chevrolet Part Numbers, two different animals.

[Pat M.]

Re: 1994 LT1 Intake Manifold Casting Number

Folks, first question to the LT4 individuals.

Did you locate you intake manifold number after removing the right side fuel rail cover?

Charlie, correct, I found my intake manifold number after removing my right (passenger side) fuel rail cover.

[Pat F.]

Re: 1994 LT1 Intake Manifold Casting Number

Pat, thanks for the response. I do not know anything about the LT4's

It should be an interesting write up to Tom Barr concerning the confusion in the numbers shown in the Judging Manual pertaining to the Intake Manifold Numbers.

The LT1's and the LT4's have a completely different numbering genesis. Not even taken into consideration that a part number shown is the same as a water pump number.

[David L.]

Re: 1994 LT1 Intake Manifold Casting Number

Is there anything in the judging manual about the AC Rochester part number and date code stampings on the top surface of the intake?

[Pat F.]

Re: 1994 LT1 Intake Manifold Casting Number

David, thanks for your input. There are no references in the Judging Manual on page 142 about a date code or AC Rochester part number.

Would you please send some photos of the items you mentioned.

If you can not download on this Forum, perhaps you can send them to me at fulassoc@comcast.net.

I am in Florida away from my Corvette and I can not see what you are referring to at this time.

If you can not provide photos any descriptive information would be appreciated.

[David L.]

Re: 1994 LT1 Intake Manifold Casting Number

Charlie, Here are two photos of the top of the intake on my 1994 Z28. The AC Rochester part # and date code is on the driver's side on the top surface. I would think that the 1994 Corvettes would also have these stampings since the same intake was used (casting # 10108630). Refer to my July 5th post if you can not read the numbers. Dave

[Pat F.]

Re: 1994 LT1 Intake Manifold Casting Number

David, I think what you are showing is the fuel rail cover information.

On page 136 of the Judging Manual it calls for the number 170955191 for the 95-96 fuel rail cover number. This number is incorrect in of itself as it has it has an additional 5 in it. Should be 17095191.

I am attaching first, a photo of my fuel rail cover. On it you will see the information you previously presented. Also on the fuel rail cover you will see 2004. This is a Julian Date Code of July 19th 1994. I have a build date of August 4, 1994.

Additionally in the Judging Manual on page 136 it states that KNP2 should be present. This has been shown to not to be all inclusive. I have and so do other members , the notation of KNP1. The number after KNP could indicate a shift.

Also I am attaching a photo of an intake manifold that has the correct number, according to the Judging Manual, for a 1994 LT1.

Please get back to me if I misunderstood you.

Thanks for your participation.