WTB Big block pulley
- Thread starter Matt B.
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diesel_lv
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It's simple math. Divide the diameter of your crank pulley by 0.95 and you get the diameter w/p pulley you need. Over cooling won't hurt either though. Divide crank pulley by 1.4 and that's the w/p pulley diameter used to cool a/c cars but with a 3.5" diameter w/p w 6 vanes.
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My 1975 225's factory WP pulley (single groove), fan spacer, and 7 blade fan all are working out well on my 383.
Here is what I have. Water pump pulley 6 7/8 diameter x 2 11/16 tall. Big block non ac.
2 groove crank pulley. Big block with power steering. 6 11/16 diametet x 2.5 tall.
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gtxrt
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seems you would want a smaller water pump pulley with ac so it would spin faster, do mean divided crank pulley by 1.4 would give a smaller 5 inch pulley ? my ac pulley is 5 inch
diesel_lv
Well-Known Member
Yes, you are correct. I mixed up the 2. I'm going to edit, thanks. And the reason for smaller diameter pump n fewer blades for a/c water pump is cavitation. However I use 1.4:1 ratio w a Flowkooler high volume w/p but also use Water Wetter and have had no issues. But when keeping stock, I prefer to go w what the engineers designed which is what the attachment above shows. Thanks
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