I look at e bay all the time in order to see what is for sale. There have been a lot of R5/P7 and now R6/P8 engines listed. I've noticed that many of the R5/P7's are for sale between $6,000 to $11,000.

The dynamometer sheets indicate maximum power at 9400 RPM with a flat tappet camshaft. The things evidently make 860 horsepower there as well.

How do they do that and keep the motor alive for 500 miles?