96s-10ss

iTrader: (16)

iv decided to port my 862 heads and use them. problem is they have the notch. if I have tge notch welded and milled when I have the heads done, can I use any mls gaskets again? if not what mls gasket can I use. its a big shot nitrous motor so a mls gasket is a must!

A.R. Shale Targa

iTrader: (2)

welded, milled, MLS.....probably gonna wanna use ARP studs for the BIG SHOT

Damian

iTrader: (89)

I've installed "notched" heads with MLS gaskets before. As long as you're using ARP head bolts and TQ them to 80-85ft lbs on the final pass, it'll be fine.

For nitrous, I'd definitely have them welded and probably use studs rather than bolts.

96s-10ss

iTrader: (16)

I have arp studs now. I just think welding the notch would be a wise move for quench area

chrisfrost

iTrader: (8)

Where's the notch You all are talking about ,,,,,,,,,is it across from the existing quench area ?

wildcamaro

iTrader: (15)

yea what is the notch youre talking bout?

96s-10ss

iTrader: (16)

its like a pry point for removing the heads. right next to the "o-ring" part of the cylinder seal on the head gasket.

thunderstruck507

iTrader: (18)

I've never heard of this before...

2xLS1

iTrader: (25)

Unless something has changed they would leak coolant if used with anything other than the graphite gaskets. Has nothing to do with the quench area.

96s-10ss

iTrader: (16)

why do they leak coolant?!

96s-10ss

iTrader: (16)

I mean flat is flat! if I weld the notch and mill it smooth then put a mls gasket in there, how can there be a problem? all other ls1 use mls head gaskets! unless these heads are different and wrong for the coolant passages I see no issue. am I correct?

butler

I know about the notch I have had to 1999 camaros. It only effects the type of gasket you use. They can be welded.

3rdCoastPowerSports

iTrader: (5)

How can that notch effect anything? The gasket would still seal

96s-10ss

iTrader: (16)

according to people, the gasket does not seal...

BA in KC

Count me among those saying the MLS gaskets don't seal 862's. Going with graphite and copper coat. ARP studs

Darth_V8r

iTrader: (4)

Flat is flat, but a steel gasket doesn't comfort to shape in the way that softer gaskets do.

In general, If you use MLS gaskets, the notch will not compress the gasket locally, so there will be almost a bump in the head gasket right there at its thinnest point right next to the cylinder wall.

I've seen slow coolant leaks that acted like cracked heads or cracked blocks from this issue. One time I saw water come pouring out between the head and block while filling the radiator.

The felpro permatorque is a mls, but it has a relief cut out of the gasket at the notch, so it seems to seal ok. There are certain MLS gaskets that you can use, but you have to do your homework to see if they are relieved where that notch is. The graphite gaskets are soft enough to compress so they seal fine.

oP, if the notch is welded and milled properly, yes it will work. If you are looking for .053 or .041, then you can use fel pro permatorque MLS gaskets without having to work the heads. That's what I'm using. Copper coat the **** out of it like BA said

coltboostin

I used this thread as a point of reference for my build-so I thought I should add a note for people searching in the future

I got my 853's to seal with a stadard GM MLS and the trusty Indian Head Shelack. This is with 800+whp. No leak issues whatsoever

https://ls1tech.com/forums/forced-in...l#post18984264

spray280

iTrader: (5)

Just to add to an old thread, I had 1 notch head on my engine &
it sealed fine with cometic gasket, copper spray & arp studs@85lbs.
No leaks even with 20lbs of boost.