My O-320 STC bumps the gross weight from 1600 up to 1760. The fastback (1959-1963) models gross at 1500 and the STC does NOT bump those- it stays at 1500. There's an STC addressing this issue, which sometimes legally turns these 150/150's into single-seaters. I don't know why the gross doesn't go up on the early models, maybe structural differences?

Yeah, big structural differences with the early models. They were basically a 140 fuselage up to the E model, although D and E had omnivision..

Dusting this off.. so if my 62 150 ( with the cac td stc ) is just a 140 fuse.....
are the longer 140 gear legs compatible with the existing mounts?