Good advice. Port volume should be an essential part of your decision in planning and picking the head that best suits your wants. Last winter I picked up a set of older Ehead round ports. They had been previously worked so I'm not sure how big they are now. Out of the box they were advertised at 215cc. They are probably more than that now. I replaced my 16 iron heads on my 400 and they killed my low end. I didn't know about the "lazy" air charge due to the port size. Apparently they would require a much bigger cid to get the full potential from them. Don't get me wrong, they still run fine but for a 98% street car it can be sort of disappointing when you can't spin the tires at will like you could before. Planning and knowing is everything before you buy.
Al, flow is 310/239 at what lift? Runner cc? CID of motor? What cam?
