In regards to the comments in this thread about crate engines. A friend of mine put a new GM 572 / 720hp crate engine on his dyno... It wouldn't make 680hp no matter what we did.
I've personally fixed five crate engines that were purchased because they "come with a warranty". All five had issues within the "warranty" period and the owners chose to have the issues "fixed right" rather than use the "warranty".
The 4.6 Ford's have issues also...in addition to launching their spark plugs into orbit!
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