Browsing this information, it seems the top causes of failure are: lean conditions as ambient air temps change, fuel system problems, overheating (specifically on the driver’s side). All these result in high cylinder temps. Failures occur often in high-speed long pulls on the highway.

One of the themes that seems to pop up often is broken ring lands. It seems that the factory ring gaps probably close up under high heat, pulling the top off the piston. I’d suggest wider ring gaps when you put it back together.

The other theme evident through this thread is lots of boost and hard runs. As the boost goes up, things become more critical. One guy told of running 19# boost but on a cool fall night the temps dropped and his boost went to 21.5# and the motor blew at the drag strip.

Bottom line: I’d find a stock 04, owned by a 55-year-old since new, with 8K miles, and if you could get it in red for $18K, that would be the deal!

This is the ‘mother of all threads’ on this subject: http://www.modularfords.com/forums/showthread.php?t=12489 Browsing this information, it seems the top causes of failure are: lean conditions as ambient air temps change, fuel system problems, overheating (specifically on the driver’s side). All these result in high cylinder temps. Failures occur often in high-speed long pulls on the highway.One of the themes that seems to pop up often is broken ring lands. It seems that the factory ring gaps probably close up under high heat, pulling the top off the piston. I’d suggest wider ring gaps when you put it back together.The other theme evident through this thread is lots of boost and hard runs. As the boost goes up, things become more critical. One guy told of running 19# boost but on a cool fall night the temps dropped and his boost went to 21.5# and the motor blew at the drag strip.Bottom line: I’d find a stock 04, owned by a 55-year-old since new, with 8K miles, and if you could get it in red for $18K, that would be the deal!

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