They were for a built Honda racing engine, the turbo manifold had a thicker flange than the original, the original bolts are not long enough, plus it is a race car bolt in an aluminum head and the aluminum head unscrews after a good couple of torque cycles, they are very good, they were able to fully sink into the head, machine quality tolerances, the threads were nice and tight, there is no loose thread. Comes with lock nuts, these are high quality studs and the nut is 13mm and the standard is 12mm. SWEET. I recommend them.
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