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That being said tonight I started searching and found that the 2008-2012 Ford Duratec RS/ST has the same stock crank pulley (Ford PN 1388487) which makes sense given it's the same engine.

That being said I found that Anembo engineering has an anodized (104.99 GBP) and unanodized (99.99 GBP) solid aluminum crank pulley. It is located here: https://anemboengineering.co.uk/engine-2/?sort=featured&page=4

It is also on Ebay for those that wish to shop through there sold by various resellers of their products.

Says it's made from T6 6082 billet. Anembo doesn't do shoddy work so I plan on upgrading when time comes. Gotta remove the old one anyways. I did the math and the difference in weight comes out to just under 1/4 use of energy to rotate the lightweight one. I'll do a rough HP conversion tomorrow. Gotta go to bed.

Update - I did the math today - A stock crank pulley uses up just over 4HP to turn at 6500rpm and 1/2HP to turn at idle. The lightweight unit will use ~1HP to turn at 6500rpm and about .05 HP to turn at idle. This is a rough estimate, using the math of an evenly distributed cylinder, not properly measuring the inside/outside radius of the primary weight, so it will vary slightly, but this is a close enough ballpark for the time I had available today.