David has it right. I have a detuned version and it was not 75k for the motor. Closer to 15k. It has 7500 miles, plenty of track time. All I have done is change plugs, change the
oil, adjust the valves and replace broken tranny and rear end parts. 12 to 1 compression, 660hp at 7200, 358ci. It is very streetable. I run pump gas on the street without any problems. The tires spin so there is not much load plus with 3.89 gears, it cranks up fast. On the track, race gas as thmotor is loaded and thrashed with slicks. The power is obviously there, but the longevity of the motor is the reason that I would do it again. I have been wondering about the valve springs, allthough it was seeing 8200 rpm at road america without valve float so I will keep my fingers crossed. scott