I will use TT heads if I plan to put it in my track car with all the goodies done to the heads. I was just thinking of using the NA heads for a street car.
As for cyro iv heard good things about it. iv cyro'd my brake pads and rotors and iv notice that they last longer and have less brake dust on my wheels. from what iv been told about cryo blocks is that the metal where it has contact with other metals. that it is a lot smoother. I guess it would be like color sanding your car after getting painted. Its just smoother. don't know the exact details and why. but something about the metal molecules lining up. that makes the metal stronger and smoother. Something like that. I'm not an expert by no means. just what iv heard and read.
