Major issue with my 03 engine

[NASTYCOBRA]

After 4 yrs of building this car, and massive amounts of money, which is a 1967 Mustang fastback with an all 2003, 2000 R Cobra drivetrain, brand new 2003 Cobra crate engine, I'm hit with the absolute deflating news that there is a significant knock coming from cylinder #4! This all comes within 2 weeks from the delivery date. I'm being told it could be the piston or a wrist pin. I'm going to try and upload a video of it so you guys could comment, but right now I'm just absolutely sick! My file is mpg so I might not be able to upload it. Any thoughts?

 

[Uncle Meat]

You didn't by chance take the car out on a extended high speed run in top gear did you? The stock PTW clearances on these 03/04 engines is really tight to say the least and there's been more than just a handful of Cobra owners who've burned up their motor because the piston expanded in the cylinder due to excessive heat.

U.M.