Quick Tech: The Ins and Outs of Copper Head Gaskets - DSPORT Magazine
DIY How to install copper o-rings in a Block - Honda-Tech - Honda Forum Discussion
high hp guys... O ring head or the block?? - EvolutionM - Mitsubishi Lancer and Lancer Evolution Community
Amazon.com: Water Pipe O-Ring for Select Subaru, Toyota, Scion, and Saab Vehicles | Seals Water Pipe Outlets to Both Sides of Engine Block (Two Required Per Car) | OEM# 80693-3010 | Heavy