Like the ad says I have a black mamba Jr cam I'm willing to trade for a gx160 head that has been ported and polished to flow better. I Wil also trade for a gx200 head that has been milled .050 . If anyone is knowledgeable in this area and wants to give his opinion of which is better, the decked 200 head or the ported160 feel free to enlighten me.