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Valve Jobs Done Right. A close-up of a Honda CB750 SOHC valve seat. Though the upper 30 degree and the lower 60 degree shapes have been rough cut using Neway cutters, the 45 degree cut in the middle, the one that counts because it is the actual sealing surface, has the benefit of a stoned surface, the best possible with hand tools. Ah, valve jobs.
Lets say the engine is at 3 degrees down in back, and the pinion is 3 degrees up in front (all these angles for sake of discussion are relative to 0 degrees or horizontal), this gives the parallel angles, and if the driveshaft is at 0 degrees you should be ok.