RBOMAR, I don't know if the 441X are BBC or SBC, but om my BBC, I didn;t run seals on the exhaust side. Even though I have new bronze liners, I thought the slight inconvenience of a puff of smoke on start-up was a good tradeoff for better oiling of the exhaust valve guides. I've heard they can sieze in BBC's and I'm using 30 yr old heads!
BTW, I use teflon seals.
[This message has been edited by Gene Chas (edited 10-18-99).]