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FWIW; Z1 is guilty of the same. from their FAQ document; 9. The heads are different between NA and TT. The castings are almost the same but not quite. The intake runners are of a different design in the turbo heads. The castings offer a more open port for the TT. We have used them interchangeably before without any problems, just probably results in the loss of some power, when using NA heads on a TT. It is significant enough that it would take extensive porting to get NA heads up to TT specs. We use different spark plugs on the NA and TT but we see them used backwards and every way in between a lot. The TT ones we use are NGK PFR6B-11B which are slightly longer that the NA PFR6G-11. The longer plug is “colder” which helps with preventing detonation at higher boost levels.
Petz #3
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