Thanks Rumble. Well said. I think we have a case of apples and oranges. As mentioned, the average 3-5K $ street motor versus the 7K and up race motor. All credibility was lost when the aluminum/iron discussion started. It has all to do with the design. Not the material. The air can't tell the difference in the material. Keep up the good replies. I'm outa' here. I've got things in the garage that need to be addressed. Later.