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$5k is a decent machine shop budget for a full rebuild, including twin plug modification. I DIY’d my 930 engine build, and yes there was a bunch of “while you’re in there” stuff, but the total cost of parts and machine shop labor was almost $20k. Pistons and cylinders ~$4k alone. Had I not done twin plug, and not done case machining for 100mm pistons, I could have shaved 4-5k from the total cost.
Part of the disparity in cost is because “rebuild” can be anything from a top end reseal/re-ring, to crank out full monty.
The parts are very expensive. Try pricing out just bearings and gasket sets to do a full rebuild and you’ll be over 1k already.
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