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A second mounting plate is bolted to the compressor, which is then bolted to the main mounting plate. Ken's first design did not allow for adequate clearance between the exhaust manifold and the compressor volute, so he had to start all over--as he did on numerous other occasions. The next step was to mount the compressor head unit and plate to the engine block-mounting plate. Ken had to first rotate a V-belt type pulley (as all current pulleys are serpentine design) so that the supercharger pulley could be aligned with the other pulleys. The size of this pulley also determines the impeller speed--a critical aspect of supercharger boost--so Ken opted for a 3.70-inch pulley to keep the impeller speed below 42,000 rpm at 6,000 engine rpm. The pulley was then attached to the supercharger and lined up with the crank and water pump pulleys to determine the space needed between the two mounting plates. Three stainless steel spacers were then turned for this purpose. To add rigidity to main the mounting plate, a support was added to the front bolt of the F.I. base plate--another support at the bottom to the left-side motor mount--and for good measure, another brace to an adapter between the thermostat housing and intake manifold.