Backstory- Stock valve ported heads were not in stock for some time. Wrote to David to express my interest in purchasing one and If he could please keep me in mind once they became available for purchase. Of course David responded quickly and stated something along the lines of- no problem, its been noted and I'll keep you in the loop... Sure enough, he sent me an email few weeks later that they were back in stock, so I purchased one! Port work looks great! I will be pairing this with the DHM 149 Gen2 big bore and S1 camshaft... Highly recommend.