RE: Cen NT16 to 18 conversion
G70344-08 Piston & Sleeve $24.99
G70344-07 Connecting Rod $8.99
G70344-04 Piston Pin $2.99
At [link]http://www.ehobbies.com.[/link]
You can reuse the connecting rod and piston pin from the 16 if they are in good shape. The sleeve is not true ABC construction, I read somewhere that it is nickel plated instead of chrome plated.
I have done this mod and got a little more torque and excelleration but same top end. I have not run the engine enough to know how long this P/S combination will last.