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My 930 rebuild several years ago was just under 20k in parts and machine shop work. I did the labor. Could have saved 2-4k if I was doing a "stock" build. Last year I had Dawes rebuild the 3.0L engine in my racecar...full monty, but I had just done a DIY top end refresh (which blew up at Sebring) so some of the $ spent on things like heads wasn't in need of full rework again. It cost me something around 25k. Peter Dawe made some changes to the ports, threw in a different cams, dyno tuned the ECU and it made 270whp.
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