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Message: <blockquote data-quote="Nighttrain" data-source="post: 1397859" data-attributes="member: 21612"><p>4340 is what you want. I deal with metalurgy all day. Its the ideal alloy available right now at a good price because of not only tensile strength but heat extraction. Someone else up above suggested aluminum. For a block and heads maybe because of cooling passages and oil galleries and weight savings its ok. As a piston and rods? No way, itll melt down and bend. I will say aluminum alloys have come along way but for your rotating assembly, no way. Steel alloys is cheaper and more reliable</p></blockquote><p></p>