i didnt port or polish the vx but i have done it to the sh.18 and various other engines and liked the results. The vx is a 2 port engine and thats why it just can get the rpm or power up. You can smooth the edges and match up the ports but you wont get much more out of it. Get the sh.18 and you will be amazed by the difference and even more amazed if you p&p it.