That's what we around here call a pop-up piston and yes that is a high compression piston. Pop up because the piston dome is 'popped' up. Do you know what the standard compression is on these engines?
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1996 Mustang Cobra. Vortech Kompressor installed.
 Many pilots of the time were the opinion that a fighter pilot in a closed cockpit was an impossible thing, because you should smell the enemy. You could smell them because of the oil they were burning.
Adolf Galland
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