[chap52]

Thanks Terry, I remember back in the 80's when I could afford to fly, and flying a Cessna 150 into a strong Southern Oregon headwind, speed indicating 70 kts, ground speed calculated at 10 kts. . That's how I feel about driving old cars on todays freeways.I cruise to enjoy the trip, not white knuckle through the whole thing.
As I said I am just gathering info right now and apparently the difference between the two HC heads is not much of a gain.