In order to resurface the cylinder sealing surface of the Porsche 911 cylinder heads the opposide surface must be 100% flat to klamp the head to the milling machine.
Through the long service time most porsche 911 cylinderheads are bend and the rocker cover side must be grind.
Before this machining the studs and valve guides must be removed and the location dowels must drilled out.
Price for one set = 6 cylinder heads.
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