Here is what I purchased. The Haden 2947 Mopar short shaft HD fan clutch and Derale 17117 standard rotation 17” fan. I’m going to have to grind the inside tabs of the fan to make it work, but that is hot ridding.
The stock fan if the 7 blade unit that came on my ‘67 273 when I purchased it. The Derale is within an 1/8” of the stock fan (best I can tell). The pitch is deeper. Here are the pictures and some ruff measurements.
I’m looking forward to getting it installed, freeing up some horsepower and hopefully it will eliminate by v-belt squeaking.
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HAVE AN 18'' 7
BLADE ON THE BENCH IF NEEDED 