Just because it fits (pulleys) does not mean it works. Bouchillon performance (randy) still thinks that you can run 440 (non ac) water pump pulley with stock two grove crank pulley (thin damper) on a street 1970 hemi. I am 100% convinced that the ratio does not allow water movement at idle. I have spent thousands of $$$ with moparts sponsors, but at some point when you sell a product that doesnt work you should stand behind it or at least not sell it anymore for the above application. (that includes 440-source) So I am still looking for a water pump pulley (non a.c big block) with 5.5 diameter that would work for my setup.