No-Blows work great! I cannot fathom why anyone would use the old
copper/asbestos "Sure Blow" gaskets when No-Blows are available.
Likewise cork rocker cover gaskets when the silicone rubber ones work so
much better.

This is my experience, too. Especially on the 4 bolt continentals, it's a
lot of work to drop the thing... so why wouldn't you go the extra $$ and
install the blowproof ones?

Which, of course, makes knowing how to install the thin CU ones unimportant!

Bill Hale A&P