head notch and gasket questions
head notch and gasket questions 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!
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.
For nitrous, I'd definitely have them welded and probably use studs rather than bolts.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
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?
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
TECH Fanatic
Joined: Jun 2013
Posts: 1,163
Likes: 16
From: Avon, Ohio
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
