Bad Head Gaskets
09-08-2009, 09:10 PM
#31
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After looking up some part numbers, it appears there are two different types of gaskets made...how would I tell what type I have before teardown? Thanks
Also how would I tell what size head bolts I need?
Also how would I tell what size head bolts I need?
Last edited by kybray44; 09-08-2009 at 09:22 PM.
09-09-2009, 07:42 AM
#32
The gaskets??? Can you post some links to the two that you have found, so we can look at them?
09-09-2009, 09:07 AM
#33
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mine never overheated when it blew on the interstate at 1/4 throttle and warpped 4 thousandths. it is very possible. if you are ready to pay $1700 then just buy some new heads not worry about machining and go for it
09-09-2009, 09:53 AM
#34
Look around the edges of the head surface for the gasket material you should be able to tell what you have by scratching at it.
Its either a fiber materail or a metal gasket.
99-02 was a graphite/fiberstyle gasket - #12457116 -4.8L/5.3L GM Graphite Gasket
03-up is a MLS head gasket - #12575329 -4.8L/5.3L GM MLS Head Gasket
#89017252 - 5.3L/4.8L Complete Head gasket kit containg all gaskets need to R and R the heads.
99-03 head bolts long and short - #12498545
04-up was the change to all same size - #17800568
https://www.performancetrucks.net/fo...M+part+numbers
Last edited by 1FastBrick; 09-09-2009 at 08:40 PM. Reason: Apparently Im wrong so I edited the info
09-09-2009, 11:07 AM
#35
General rule of thumb is... ( there is always an exception to every rule so consider it a basic guide to go by. When in doubt pull your old part before buying and seek proffisional help matching up the old part )
Look around the edges of the head surface for the gasket material you should be able to tell what you have by scratching at it.
Its either a fiber materail or a metal gasket.
99-00 was a graphite/fiberstyle gasket - dont have a part number.
01-up is a MLS head gasket - #12575329 -4.8L/5.3L GM MLS Head Gasket
#89017252 - 5.3L/4.8L Complete Head gasket kit containg all gaskets need to R and R the heads.
99-03 head bolts long and short - #12498545
04-up was the change to all same size - #17800568
https://www.performancetrucks.net/fo...M+part+numbers
Look around the edges of the head surface for the gasket material you should be able to tell what you have by scratching at it.
Its either a fiber materail or a metal gasket.
99-00 was a graphite/fiberstyle gasket - dont have a part number.
01-up is a MLS head gasket - #12575329 -4.8L/5.3L GM MLS Head Gasket
#89017252 - 5.3L/4.8L Complete Head gasket kit containg all gaskets need to R and R the heads.
99-03 head bolts long and short - #12498545
04-up was the change to all same size - #17800568
https://www.performancetrucks.net/fo...M+part+numbers
)
09-09-2009, 08:04 PM
#39
AT the corner of the head were it's rounded, some of the material hangs out. Scratch at it and see what you have...