Posted for "Paul Bricker" <pbricker@earthlink.net>:

 Jim,
 
 I have a Performance Engines IO-550-Exp in my ES. I've had no problems at
 all getting oil pressure. The longest I spent was when I preoiled the engine
 by pulling top plugs and spinning it on the starter. It took 8-10 seconds
 before pressure came up. Even after several oil / filter changes its never
 taken more than a few seconds. I'd guess something is wrong. Have you called
 Ron?
 
 As for horsepower I have the same question you do when running ROP. The
 Contenental engine manual doesn't seem relevant with the high compression.
 On the other hand, I did get data from APS/GAMI on operation LOP. For 10:1
 compression the HP = 16.6 x FF(gph). That is a significant jump from the
 14.9 factor for the stock 8.5:1 compression. I'm thinking efficiency in
 cruise is another big payoff for this engine.
 
 Paul Bricker
 N63PB