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Message: <blockquote data-quote="glittle75" data-source="post: 1461631" data-attributes="member: 8675">MMR has iron tensioners for sale stating it’s a upgrade from plastic. Most of it is framed that way. That the plastic ones are inferior. But I have yet to see an actual failure or reason for it. It’s like people claim the cast cranks in the GTs are weaker than the forged cranks of the Mach and Cobras. Show me a broken Cast 4.6 crank. I can’t find one. It just seems like misinformation that spreads around without any real incidences of failure. If these fail, I will post up and buy some nicer ones. My plan is to break everything in, hit the dyno for final tuning, and then to my local 660’ on the 2 step and no lift shifting. All of that will be updated here and over on Mach 1 registry for sure!not arguing either, don’t get me wrong. But every part of this engine was thought about. Todd Warren made almost all of the recommendations for timing components, cams, valvetrain, and pistons. If someone wants to make another suggestion, I welcome it! But I would like to see the reasons for the suggestion.</blockquote>