ive recently bought a 42 1 1/2 ton that's been repowered with a blueflame at some stage. engine serial number is R71332. data ive found on 53 to 57 blueflames the R prefix doesn't come up, so im thinking it must be later than a 57 engine? can anyone confirm what year it is or any other specs on it like hp etc. its in new Zealand so will no doubt have come from Canada originaly. thanks for any help