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914 heads are type 4, except the 2.0L ones which are different.
the valve seat problem exists on all stock type 4 heads, it is easily fixed at any reputable head company
the bus is quite a heavy vehicle, which leads to early death in these motors, however 12k is way too premature for your engine to be going.
1.8L type 4 heads have the largest valves anf flows most out of all the type 4's except for the 2.0L 914 heads, and most people will tell you they are the best place to start if you're having your heads modded.
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