The 914 head can be shaved .090" to have the same compression ratio as the 848, but the intake valves must be recessed into the head the same distance to avoid valve to piston interference. Drop me a PM if you would like some more specific details on how that modification is done. It was a pretty common mod before the 848 head was available.
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!