Different stages of cylinder head development include special combination of porting and polishing, redirected ports, and multi-angle valve seats to full radius-blended valve seats. We don't use shortcuts, such as grinding and sandblasting combustion chambers, and our heads are meticulously, deshrouded and polished, Every head that comes to PURE Tuning is specifically built to the owner's needs (i.e., naturally aspirated, forced induction, nitrous oxide). Every PURE Tuning design is Reseached and Tested to maximize your cylinder heads performance for Flow, Swirl & Fuel Atomization, Flame Probigation, Durability, Reliability, and Final Finish. Endless R&D Keeps our Designs up to date and on the cutting edge of Cylinder head technology.