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Message: [QUOTE="backwoodsboy, post: 840233, member: 5415"] I've machined rods before. Not for a 7.3 but the principle is the same. AR400 would not be my first choice. Make sure you consider heat treatment of 4340. -Heat treated 4340 UTS= 195ksi vs 180-200ksi for AR400 -Heat treated 4340 Yeild= 182ksi vs 140ksi for AR400 Basically you are going to achieve permanent deformation in AR400 at a lower pressure than 4340. Necking and failure are going to occur at roughly the same pressures. Not much abrasion or impact occurring on con-rod (at least I hope not anyways), so the advantage AR400 gains in Brinell hardness is moot. Apologize if this post is brief, studying for a exam tomorrow morning. [/QUOTE]

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