What Work Has Been Done? All the sharp edges have been smoothed out and matched with the transitions through the ports. Intake has been left rough to help mix the air-fuel mixture. Exhaust has been polished for the best flow possible. Took the sharp edges out around the valve seats in the chamber as well as polishing the chamber to prevent detonation, easy clean of any carbon build up in the dome when rebuilding, not as much carbon build up as the rough cast, smoother combustion, better flow, and more. As you see I didn't hog out the ports and take down the valve guides, many people do this and it's not ideal for many applications. For most builds, velocity>CFM.

What Will I Gain? The stock heads are quite restrictive and when your head is ported+polished the right way, you will notice significant gains especially when you pair this head with a big cam, carb, and other performance parts. Flow is one of the biggest ways to make power so this head will gain you a lot more hp, torque, and rpm. This head is also not the ordinary 22cc dome head. This head has a 14cc dome that is 8cc smaller, this increases compression for more power. 

Fitment: This head has 10mm size dowel holes so it will fit GX160, GX200, 196 Clone, Predator 212 Hemi. The Predator 212 Non-Hemi runs 11mm dowel pin holes for the block and head so to use this head on a predator 212 Non-hemi block you can check out my other listing that will be the same head but includes special 11mm stepped to 10mm dowel pins that allows you to use a 10mm dowel head on a 11mm dowel block. Or you can drill the holes to 11mm on the head.