This is what the note packaged with each of the Medallion .051's shipped says:
The long-awaited special run of Cox Medallion 051 engines are here.This engine is special and distinct from other engines in the Cox line and is NOT simply the Killer Bee 051 piston and cylinder on a Medallion case. They are different in the same manner that the (NOS legal, slit exhaust) .049 Medallions are different from the Killer Bee's:
- the Killer Bee has a lighter weight, tapered piston
- the Killer Bee has a tapered cylinder similar to the Tee Dee
- the Killer Bee has sub piston induction similar to the Tee Dee
- The Medallion 051 has the familiar ID groove in the piston skirt
(And, it should be added (2008) that the Medallion .051 cylinder has a single boostport and dual bypasses, but the exhaust timing slits are different from the Killer Bee engines, making it unique from any other Cox ever manufactured.)
The engines came without serialization, however each has been numbered so that a record exists indicating who ordered each engine. Engines were numbered in the order pulled from the pallet and shipping in order of the postmarked date of the order wherever possible. The delays were numerous, and with Cox being taken over by Estes, it looked as if the original agreement would not be met... we can be thankful these were produced at all - we received 258 of 300 engines ordered and at a higher price than initially agreed. There were not enough parts available to produce 300 .049s (cases, etc.-RKB)... so what they had (258) were produced as these special order .051s. There will probably never be more new Medallions"