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Clive and I both used a shop in Kitchener. It's old school and the shop has been doing engine machining for decades, I'm sure they can do the 928 heads too. Let me know if you are willing to drive out here and I'll dig up their contact info.
Any recommendations for a machine shop to resurface a set of heads from an 88 928? I found these guys in Mississauga, but I have no experience with them. http://www.autopower.ca/
Contact keltech they will know they have tons of 928 in all the time
Beatty & Woods in Mississauga really know their stuff and do lots of Porsche stuff. Bramalea Road. I was referred to them and they did the 243 heads on the LS engine.
Liam for Keltech uses Bill Thorne/Motex, at least that is who I was referred to by him. They are far, out in Beeton, north east of Orangeville. Great work and great guy, knows his Porsche stuff but kinda far for you.