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Nice drawing......except for the hardware layout. Millwright 101 rule NEVER use a lock washer and a flat washer together....the bolt is not locked to anything and can un-screw......I've got a direct drive 19" 11 blade reverse rotation fan on my '67 Coronet w 496" stroker n serpentine belt. Can't run a fan clutch due to space limitations and direction. In 125° summers, I cruise at 180° easy and idle after 10 minutes idling w a/c on at about 210° which is normal. Have factory shroud. But it is very loud from the fan roar. Here's a diagram of proper fan/shroud placement. View attachment 1640883
BOB RENTON