Originally Posted by neuropel
Is the port job for this head something a typical speed shop could do (i.e. are there tricks here that a non-Opel shop would have trouble with or potentially ruin a head)? Is this head set up for the 1.94" intake/1.60" exhaust valves?
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I'd say any competent speed shop/machinist could do this work, but they have to overcome their 'this is how we do it on a Chevy' attitudes. It just doesn't work that way for Opels. This head has the 1.94"/1.60" valves, yes. In terms of ruining the head, there are areas in a 2.4 head that you must be careful with, particularly near the head-bolt holes passing between the intake ports (thin casting here), and especially #1 exhaust port should not be 'reshaped' to match the rest of the exhaust ports. Intake spring seats should not be milled to match the exhaust seats (I've seen people try though), or you'll weaken them or break through altogether.
So to answer your question, a non-Opel shop
could ruin an Opel head in many different ways if they were misinformed or just not careful.
Bob