That's a really tough call to say the o-ring is actually sealing. You can test it out with a regular washer on the bolt head to see if it leaks. If it does, than stay with a copper crush washer... Or better yet, get the 02 housing with the shorter bolt for better water protection as D-911 pointed out.


.

__________________
1983 123.133 California
- GreaseCar Veg System