Posted for bob mackey <nospam@pure-flight.com>:

 During our pre-Oshkosh inspection, we found some problems
 with our O-320-A2B narrow deck engine. There is a considerable
 amount of gear wear, and the compression is a bit off in one cylinder.
 With 1600 hours (and 33 years!) SMOH, it is time to do a complete
 overhaul or exchange. While we are at it, we would like to allow
 for a C/S prop, but want to avoid building a new exhaust or engine mount.
 
 How much should I expect to pay for a good rebuild or exchange?
 Which model numbers are near-drop-in replacements that won't require
 me to replumb or build a new set of baffles?
 In particular, there seem to be a bunch of O320-E2D engines in the used
 market. Are there significant differences between an E2D and an A2B?
 
 Any suggestions for rebuild shops or engine details will be appreciated.
 
 -bob mackey
 bob -at- pure-flight.com
 

[ bob.... some data from the Lycoming engine list, recently uploaded to the LML website:

O-320-A1A 150 2700 80 7.00:1 Controllable prop, 25° spark advance, Bendix –27 S4LN-20 and S4LN-21 Magnetos

O-320-A2A 150 2700 80 7.00:1 Same as –A1A but fixed pitch propeller -27

O-320-A2B 150 2700 80 7.00:1 Same as –A2A with straight riser in oil sump and -27-32 carburetor

O-320-E1A 150 2700 80 7.00:1 Same as –A3B but with Type 1 dynafocal mounts -27

O-320-E2A 150/ 2700/ 80 7.00:1 Same as –E1A but with fixed pitch prop. and uses 3/8 -27140 2450 in. attaching bolts and has alternate rating of 140 HP at 2450 RPM

O-320-E2D 150 2700 80 7.00:1 Similar to –E2A but with Slick Magnetos, O-235 -27front main bearing and 7/16 in. prop. flange bushings

HTH... -marv   ]