Check for a bent pushrod or a broken exhaust rocker arm on #5. If it can't get the exhaust out, it can 't make any power on that cylinder, but the compression will still be there.
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!