head notch and gasket questions
#1
On The Tree
Thread Starter
iTrader: (16)
Join Date: Dec 2005
Posts: 190
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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!
Trending Topics
#11
On The Tree
Thread Starter
iTrader: (16)
Join Date: Dec 2005
Posts: 190
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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?
#16
Moderator
iTrader: (4)
Join Date: Jul 2014
Location: My own internal universe
Posts: 10,452
Received 1,851 Likes
on
1,152 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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
#17
TECH Fanatic
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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
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