badazz81z28

iTrader: (6)

When I took my heads off I noticed this bluish oily residue on the heads. Since the MLS gaskets have what appears to be black O rings, do they need to be lubricated prior to installation?

djfury05

iTrader: (30)

No.. clean the block's deck surface off really well. For the final wipe I use just rubbing alcohol and let it dry. MLS gaskets can go on dry no issues.

batboy

iTrader: (6)

The last head gaskets were probably graphite. Make sure you clean up all that gunk real good.

badazz81z28

iTrader: (6)

No, they were MLS just like the ones I bought. This is a 2004+ls1

NVR_SPDS

iTrader: (39)

I just recently installed GM MLS gaskets, and although Ive heard you can use the copper spray, I installed everything clean and dry. Worked out great, no leaks, no issues.

SF 1HOTLS1

iTrader: (24)

do MLS gaskets leave gunk on the block that needs to be scraped off? or do they just come right off the head clean?

JS01

iTrader: (10)

They leave a thin black rubber/sealant like compound on the heads and block. It must be scraped off well before re-installing the heads.

badazz81z28

iTrader: (6)

Nope, not really. Its just steel with rubber type O rings around the sealing areas. Mine is super clean, no scraping will be required for me.

This is what it looked like after I pulled the head. You cant really see anything, there is just rubber looking material here and there around the cylinders and bolt holes.

SF 1HOTLS1

iTrader: (24)

looks clean to me! i figured since its steel there shouldn't be much to scrape.