I have a d16A6 block with new rods and pistons bored 30 over. I have access to a Z6 head. Which will be better for a turbo in the future. I have heard many guys argue the point of non vtec being better because of tuning ease, but also all the major racers run vtec heads in their cars. Somebody said the A6 head flows better and also is there anyone making cams and valvetrain for the A6 head. Any info will be helpful.