True repair shops do their own valve work. We only send out for milling if needed. Of course I come from a different era where all manner of things got fixed, alternators, pS pumps,gears, diffs, trans, AC compressors, all were repaired 20 years ago.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician