There is absolutely nothing wrong with using NTP fittings. Tapered threads help seal, and as long as they are properly installed using teflon tape and are not overtorqued when tightened up, there really is no risk of damaging the block... proper tappnig procedure is also vital when working with polycarbs. Displacement taps are not recomended while taps that cut material out (the most common type) are the way to go...
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