http://www.racingheadservice.com/Information/ArticleDetails.asp?ID=-1228096506

For old flat tappet cams and changing oil.
add GM p/n 12345501 prelube at every oil change.

Dam I went to my local Chevy dealer it town (Walled lake Michigan ) and they do not stock the GM prelube 12345501 I ask them to order me one and they said I would have to get a hole case (oty 12) ? what the hell is up with that Tod! (Only joking :)see ya at multi lakes cruise night)
They did tell me the dealer in the next town had some.