What happens when you run 26psi of boost on a stock Buick V6?

ThisBlown headgasket 1:

That little bit of currugated metal is the head gasket. It blew right at the top of cylinder #4. I was going 111mph in 3rd gear at the time at Lucas Oil Raceway in Indianapolis. It was the first time covering the quarter mile since I had converted the car to run on E85. It had never gone that fast before (previous best MPH was 104), so I neglected to shift into fourth, and the gasket failed somewhere north of 5000rpm.

Here’s another shot with the head off.
Blown head gasket 2

There was no other damage to the engine at all, but after measuring the cylinders, #4 was way out of spec, which prompted a rebuild.

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