transmission fluid in oil
You can read the part in the Sea Foam sticky about the stuff.
.
http://www.lmperformance.com/6299/1.html
Remeber with cam swaps sometimes base circle diameter changes, thus changing lifter preload, requiring different length pushrods.
Finally, take a look at this article.
http://www.pistonslap.com/tsb/020601038.htm
It seems some of our LS motors were sewing machines in a previous life, but that doesn't mean we can't keep the noise level down.
Good Luck.




