Here is the piston mod. ive done this to 2 different engines. a .21 O.S. RG-B, and a Thunder Tiger pro .12. The idea is alot like the Paris Dish engine but my idea works a little different.
Here is a close up of the RGB ports before and after shots of the modification i did to the port. the one on the left is before. notice how much more i opened it.
Here is a close up of the Rex blue head 7 port, and the Ofna P-4. notice on both they have factory mods to the top edge of the exaust port.
Here is a close up of the Megatech port and the Thunder Tiger pro21 port. Notice how cheesy the megatech looks. The pro 21 (right) looks great. you can see the top and bottom edge of the sleve. its open for any mod you choose. cut the top for increased RPM or the bottom for increased low end. GREAT ENGINE!
These are the O.S. CV .12 heads. These heads are junk. what was O.S. thinkiing when they built these things? power block my eye. Terible heat transfer, this has to be the worst head. pictures of 2 heads one i snaded and grinded on. ill never use em.
