Couple Engine Questions - #9 Auto Patrol

Couple questions:

1) What is the engine model (gas)? The SN of the engine is 9A201
2) Was this model used in any other equipment (R2?)? I believe the #10 used a 4400G (?) which was used in the R4?
3) Are the cylinders press in or are they part of the block?
4) What is the correct torque / untorque sequence for the cylinder head?

Thanks all!

engine 9A201 is a 4200G same as cat 20 crawler
cylinders are individual