Post by
boost_boy »
https://forums.nicoclub.com/boost-boy-u2853.html
Sat Nov 01, 2003 4:20 pm
Since the gasket is already metal, it is already too hard to accept an O'ring. You usually would use the o-ring combination on a copper headgasket whereas the material (copper) is soft enough to accept the o-rings. Most major metal headgasket manufacturers already have an o-ring on it for extreme sealing duties.