I used Engine Machine Service in Inglewood professionally.
The only thing I don't trust them with is rocker arm refacing. Otherwise, they did work on aluminum and magnesium engine cases for me, polished and crack-checked cranks, and did head rebuilds and porting work. They're not cheap, but they're fairly priced.
I also use Motor Works Inc. in National City and they're alright. Head work isn't as good as EMS, but Mike does the piston fitting, crank and case work and is skilled.
Beyond that, my knowledge is fairly specific to air-cooled VW and Porsche.
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