A pocket porting job was part of building the cheater heads I used to produce. They definitely wouldn't pass an engine teardown, but very few competitors wanted to pony up the money for that kind of protest.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!