I am considering buying a used Davis head for ST.40-.51's. Does the "kit" only include the head? How do these engines cold start? I have considerable knowledge of Diesels but I realize that these conversions must still not compare to larger engines in compression, fuel used, and method of ignition timing. Obviously a ST .40 is not capable of the 22 or 25:1 compression ratios I am used to. By memory I think the minimum I have ever seen in a "full size" application was 18:1. Are the model Diesel fuels of a high enough Cetane to start and run by "low compression" alone? If I did make a successful conversion of a ST .40 what kind of performance should I expect at about 4500' above sea level?

Thanks in advance. Take care, Cliff