Unfortunately, the guys that can afford to pick that engine up do not perceive now to be the right time to buy it. With the fed telegraphing that it will be forcing increased inflation, the perception should shift to one where that SOHC engine will be priced higher next year than it is this year. That's when it becomes a bargain now and will be picked up. It's not an "engine thing," it's an "economy and perception thing."
