NPG technical papers: http://www.lyondell.com/html/products/markets/coolants/technical_information/technical_papers.shtml ************** Jim In Mesa - James Lidberg jameslidberg@domain.elided '79 Scout II/4X4/345/Edelbrock 1400/727/D20/3.07 open/PS/PB/4"Trailmaster Copyright 2004 All rights reserved