Hey there. Now, a 3.5cc engine would be a nitro engine. The best nitro engine that I know, which is ALMOST 3.5, is a Traxxas TRX 3.3. This engine is a 3.3 CC engine, and is almost to your needs. I would recommend using a TRX 3.3 with an EZ-Start, its an electric starter. Makes it SO much easier.