Attn Ohio boys: O-ring question
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
So I am going to follow your recipe (that you guys have helped me with in PMs a couple months ago....but I have erased them!!!). I am going to o-ring my afr 225s, run a gm mls gasket (5 layer) on my 4" bore 364 iron block. NO reciever groove.
1. What thickness o-ring?
2. How deep do I have the groove in the head cut that the ring sits in?
3. How much of the ring should protrude?
Thanks guys. I just want to get the combo right!
1. What thickness o-ring?
2. How deep do I have the groove in the head cut that the ring sits in?
3. How much of the ring should protrude?
Thanks guys. I just want to get the combo right!
Trending Topics
#15
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I called cometic about them and they laughed at my application. They said their standard mls is fine for 1000ish whp, and the phuzions are desigend for 2500ish hp cars and such. lol
Ohio boys: What thickness o-ring?????
#16
TECH Resident
iTrader: (43)
Join Date: Jan 2003
Location: Dayton, OH
Posts: 920
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Ok, first off that was some good info you guys just went and threw away. ![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
O-ringing the head with the GM MLS gaskets wasn't the cure all. But it did allow me to go faster and push less water.
As far as the specs on the o-ring in the head...I'll have to take some measurements.
My newest setup uses a copper gasket. With an o-ring in the head and a groove in the block. I can make 3 back to back 8 second passes and not push a drop...I just push air now.
I have an expansion tank mounted high above the motor. That is only half full of water. I don't know how you could do it with a stockish radiator setup though.
You can see it here to the right of the TB.
![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
O-ringing the head with the GM MLS gaskets wasn't the cure all. But it did allow me to go faster and push less water.
As far as the specs on the o-ring in the head...I'll have to take some measurements.
My newest setup uses a copper gasket. With an o-ring in the head and a groove in the block. I can make 3 back to back 8 second passes and not push a drop...I just push air now.
![Nod](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_nod.gif)
You can see it here to the right of the TB.
#20
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Help me out big guys? I'd hate to ruin my AFR 225s with the wrong size o-ring. What size you all using? How deep do you cut the grooves in the head to set them in? And is 0.007" a good amount to stick out....like the other member suggested?
Thanks for all your help (and little secrets). Its what sets this site (and FI section in particular) apart)!
Thanks for all your help (and little secrets). Its what sets this site (and FI section in particular) apart)!