There are two machinists I can highly recommend.
First is Mark DeGroff's Cylinder Heads in Northridge.
Address: 18736 Parthenia St, Northridge, CA 91324
Phone:(818 701-5274
Second is Costa Mesa R&D in Costa Mesa.
Address: 123 Monte Vista Ave, Costa Mesa, CA 92627
Phone:(949) 631-6376
Both...