python maybe you should shut you ignorant F@@king mouth before you get yourself in trouble. for one ive never seen a rod break on a bad tune and for two maybe you should see how the owner of fast specialties can drive over his own crank on a new 347 that he built sounds like some quality crap, yes i witnesses it with my own eyes thanks. my tune was a safe one and was just to drive to the dyno. no jeff it wasn't what we thought about the piston on number 6 all pistons were fine its rod on number 1 or 2. for those who want to know about what he is talking about. i bought the car wrecked in peices and the motor low miles used, well after i put it all together i started it ran great, first time i cracked throttle a tick started then it started to miss. checked motor and found number 6 to be missing, i pulled plug and found end smashed.used boriscope at dealer found a bolt on head of number 6 piston. well we got it out and it ran fine i drove it for a month this summer n/a perfect. after i blew motor i pulled all plugs yes they looked dark and safe. i was involved insetting chip for base tune so you insulted me also python. just caused some can buy a dyno doesn't mean they know how to use it, and just because someone grew up around fords and a ford shop sure doesn't mean they know anything about latemodel vehicles or how to tune them.