GM listing left & right head gaskets?
I have noticed that GM is showing different part number for ls1 head gaskets.
Left = Pt.#12558810 $39.00 each Right = Pt.#88894342 $319.00 each Is it necessary to use both numbers or just two left ones (Pt.#12558810)? Does anyone know the different thicknesses of Cometic GM Fel Pro thanks,Jim |
No, dont use two of the same. You will create a cooling nightmare. By doing that, you will be blocking the rear cooling passages on the right side of the motor. You'll cook it in an instant. Not to mention building a new motor.
Stock GM MLS gaskets are .054. I am running Cometic .051. Believe it or not, one of the best things on the stock motor, is the head gaskest. Unless your trying to bump up the compression, or tighten up the quench, your wayyy better off going with the GM gaskets. |
Originally Posted by Slow C5
(Post 1562212201)
I have noticed that GM is showing different part number for ls1 head gaskets.
Left = Pt.#12558810 $39.00 each Right = Pt.#88894342 $319.00 each Is it necessary to use both numbers or just two left ones (Pt.#12558810)? Does anyone know the different thicknesses of Cometic GM Fel Pro thanks,Jim Are the gaskets you're looking for going on your 2000 LS1? Robert |
This is something I am debating right now as well. The Cometics have a performance advantage but the surface preparation, flatness of the block and surface roughness are very critical. The GM MLS are very forgiving as MLS gaskets go.
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Originally Posted by Slow C5
(Post 1562212201)
I have noticed that GM is showing different part number for ls1 head gaskets.
Left = Pt.#12558810 $39.00 each Right = Pt.#88894342 $319.00 each:eek: :eek: :eek: I hope this is a misprint:willy: Is it necessary to use both numbers or just two left ones (Pt.#12558810)? Does anyone know the different thicknesses of Cometic GM Fel Pro thanks,Jim |
Originally Posted by LoneStarFRC
(Post 1562213062)
Jim,
Are the gaskets you're looking for going on your 2000 LS1? Robert |
Originally Posted by Slow C5
(Post 1562215268)
Yes it is a 2000 LS1 engine in question.
Where did you come up with the other numbers you listed? Also, the right/left info too? |
Originally Posted by LoneStarFRC
(Post 1562215726)
I just checked and the correct number for you should be 12600530. BTW, that number is now current for '97-'07 5.3, 5.7 and 6.0 LS engines, including the Corvette applications of course.
Where did you come up with the other numbers you listed? Also, the right/left info too? 2000 Chevrolet Corvette V8-5.7L VIN G Vehicle Level Engine, Cooling and Exhaust Engine Cylinder Head Gasket Parts Information Parts Information Part OEM Part Price Cylinder Head Gasket Head Gasket 2 - Right 88894342 $319.92 Notes Contact dealer for most current part and price information. 2 - Left 12558810 $39.07 Notes Labor Skill Level Mfg. Warranty Standard Cylinder Head Gasket Replace Right Bank B 4.5 7.2 Notes Includes: Remove Carbon And Make All Necessary Adjustments. Left Bank B 6.6 6.6 Notes Includes: Remove Carbon And Make All Necessary Adjustments. Both Banks B 9.3 10.8 Notes Includes: Remove Carbon And Ma |
My mistake here. I was thinking exhaust manifold gaskets and you are looking for Cylinder head gaskets. :ack:
OK, here's the numbers you need: RH 12558809 LH 12558810 They are the same price. $30.43 ea. through Forum vendor Fichtner Chev. Call: 1-800-234-5284 and speak to Bob. He'll fix you up. BTW, that 88894342 is not even in the GM part number system at all. It MAY have been a "valve grind" set (commonly called), as that price is so high. |
Aren't those the numbers for the graphite gaskets? Why not MLS?
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Originally Posted by vettenuts
(Post 1562216016)
Aren't those the numbers for the graphite gaskets? Why not MLS?
Robert |
Originally Posted by LoneStarFRC
(Post 1562215951)
My mistake here. I was thinking exhaust manifold gaskets and you are looking for Cylinder head gaskets. :ack:
OK, here's the numbers you need: RH 12558809 LH 12558810 They are the same price. $30.43 ea. through Forum vendor Fichtner Chev. Call: 1-800-234-5284 and speak to Bob. He'll fix you up. BTW, that 88894342 is not even in the GM part number system at all. It MAY have been a "valve grind" set (commonly called), as that price is so high. |
Originally Posted by Slow C5
(Post 1562216969)
Hi Robert (LongStarFRC) thanks for the part numbers. Helps alot. Jim
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Originally Posted by LoneStarFRC
(Post 1562216117)
To be honest, I'm not sure on composition. These are the factory stock replacement numbers. If you've used them, you would probably know better than I.
Robert |
IIRC, '01 and newer cars used the MLS(multi layer steel gaskets), I would use these, unless you have the old 97/8 heads with the casting notch in the heads(can't use the MLS)
should be about $50/pair you'll see FRONT in grey paint |
Actually, the casting notch (present on all 97/98 heads) also occured on "some" (not all) 853 LS1 heads through 2000. Also, only some of the 862 5.3l heads had the notch too.
That is why 00/01 is the dividing line. And, FWIW, I'm running 5.3 heads that DO have the notch, and the Cometic MLS gaskets are working just fine. I can't say for certain if the GM MLS definitely won't work with the notched heads...but I believe they will work. The previous owner of the heads I have did use them with GM MLS, and had had no issues. My best guess is at some point, the MLS gaskets got a slight redesign to also work with the notched heads, but I don't know that for fact. :cheers: |
Some of the other numbers have changed into a complete head gasket kit, hence the price.
The original part numbers are now higher than the kit prices. GM has added the head gaskets into a kit of 2 for about 1/2 the price. Always use the numbers below! ||--Genuine GM Cylinder Head Bolts And Gasket Kits--|| 12498543 - 97-01 LS1 Engine Head Gaskets (2) – 39.48 12498544 - 02-04 LS1 & LS6 Engine Head Gaskets (2) – 28.56 12498545 - 97-12/03 LS1 & LS6 Engine Head Bolts – 20.16 per head 17800568 – 01/04 – present LS1/LS6/LS2 Head Bolts – 18.48 per head If you’re not sure which bolt kit to use please email us your VIN# and we’ll tell you! |
Gaskets and Bolts 2000 LS1
Originally Posted by Gene Culley
(Post 1562221240)
Some of the other numbers have changed into a complete head gasket kit, hence the price.
The original part numbers are now higher than the kit prices. GM has added the head gaskets into a kit of 2 for about 1/2 the price. Always use the numbers below! ||--Genuine GM Cylinder Head Bolts And Gasket Kits--|| 12498543 - 97-01 LS1 Engine Head Gaskets (2) – 39.48 12498544 - 02-04 LS1 & LS6 Engine Head Gaskets (2) – 28.56 12498545 - 97-12/03 LS1 & LS6 Engine Head Bolts – 20.16 per head 17800568 – 01/04 – present LS1/LS6/LS2 Head Bolts – 18.48 per head If you’re not sure which bolt kit to use please email us your VIN# and we’ll tell you! Good Morning. Can you get me the head gaskets and Head bolts for the above prices? Engine is from a 2000 Convertible purchased in 1999. This is that engine I've been sitting on for almost 3 years. Getting ready to install it. Replacing all the gaskets and seals. I can contact you on Monday Aug 1st with my credit card info. Art |
I'm sure prices have gone up a bit since 2007....
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Oh shirt didn't see the date..... LOL
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