Lycoming o 360 j2a

[baobab72]

Hello
Does any body know the meaning of the suffix for the lycoming o 360 j2a mounted on the r22 beta II?
I know that O stands for carburated engine with horizontally opposed cylinders and 360 is the cubic displacement of the cyclinder in cubic inches.

Many thanks

Baobab72

[500e]

145 hp (108 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the C1C except has O-320-B2C prop flange bushings, lightweight cylinders and lower power rating for helicopter use, used in the R22
According to Wykp
http://11hc.44rf.com/manuals/engine-prop/lycoming/aerosportspower-library/360_series_ops_manual/sec_2-specs.pdf

[baobab72]

Many thanks 500, although in the limitation sections says that the approved fuel grade is 100/130. I had surfed the web prior to posting the question but i could nt find any legen for the specific combination of symbols corresponding J 2 A.
Any idea what each letter correspond to?

Baobab72