formula4437

iTrader: (1)

i got a new set of gm head gaskets part number 12498544 i got them in a kit but according to the internet they are for 2002- 2004 vehicles. but i have a 99 firebird. will they fit.

sroach20

iTrader: (31)

as long as you dont have the 98 style heads you will be fine. what is the casting number on your heads?

Shawn MacAnanny

iTrader: (12)

I think the difference in 02-04 were that there were the same head bolt lengths where as in the other years there were i think 4 head bolts that were shorter than the rest.

I'm not sure of any differences that would cause you not to be able to use these head gaskets. All of the heads can be swapped from 97-present minus the L92 and LS7 provided you get the correct bore gasket.

Mssingkid

iTrader: (7)

What he said. 97-98 Heads had a notch in them requiring notched head gaskets. 99+ Head gaskets are basically the same with the diff being you can buy a graphite head gasket(.056), or the newer GM MLS gasket(.060).

Shawn MacAnanny

iTrader: (12)

Hmm i never knew that

sroach20

iTrader: (31)

04+ had the same size head bolts.

EVIL z28

The 99's have a notch cut in them also. They are the 853 castings.

Mssingkid

iTrader: (7)

Not to burst your bubble, but only the 806 heads(97-98) had the notch and require a special gasket. the 853,241,243 heads do NOT. Unless, there was a change mid year to the castings... Anyone else want to chime in?

MagnaTransAm0098

iTrader: (10)

can you use 98 heads on a newer block? just get gaskets for a 98 style?

Mssingkid

iTrader: (7)

I'm sure you could, but I think it comes down to Why? 806 castings are some of the worst flowing heads you could ever get. If your going though the trouble of taking off the heads i'd put 243's on it.

MagnaTransAm0098

iTrader: (10)

...the question was will they work

Mssingkid

iTrader: (7)

We'll let's see... They came off an LS1, will they work on an LS1... Hmm.. tough call... Could always

sroach20

iTrader: (31)

yes they will work. if you get them ported they will flow just like the rest of them.

MagnaTransAm0098

iTrader: (10)

you like to be a piece of work huh, I was searching and they said earlier heads had a notch and claim you need head gasket for it, I have a newer block and have ported 806 heads from MTI. My simple question is do I need head gaskets for a 98 ls1 instead of a 00 LS1...I never would of guessed that a ls1 head will fit a ls1 .... I thought they fit a 2.2 ecotec.

sroach20

iTrader: (31)

you need the 97-98 head gaskets. you could fill in the notches if you know someone that can weld. then you could use the mls gaskets.

tor1965

The 07 GM performance parts catalog say:
12498543 for 1997-2001 ls1 Camaro, Firebird, and Corvette. Including the 2001 LS6.
12498544 for 2002-2004 Ls1, Camaro, Firebird, and Corvette LS1
I don’t know the difference

91ZLS6

iTrader: (2)

Might have been said, but didnt gm switch to MLS headgaskets in 01?

sroach20

iTrader: (31)

97-01 graphite
02+ mls
you can use the mls on 99+.

tor1965

Should the mls gaskets be mounted dry or should it be mounted with some kind of sealer?

sroach20

iTrader: (31)

do it dry.