Not much history prior to buying it 18 months ago. I pulled it from an '04 S with 85k miles, and put it in my '03 S.
On arrival, I hooked up the durametric to it and checked cam deviation, did a compression test on all cylinders, and split open the oil filter looking for particles: all of this checked-out very good.
I put about 1500 miles on the oil I'd put in it, and then sent a sample to Blackstone. They gave it a thumbs-up.
Since then I've put about 5000 miles on it; mainly track and to/from the track. It has performed flawlessly, no hiccups, noises, smells, smoke, steam, stink or any other thing that would concern any of the senses, haha.
Note: I installed an underdrive-pulley on it; this requires filing-off the tip of the TDC-Tool-bung on the front of the motor.
(see here for more information)
