I'm running a 390 FE with the harmonic damper that has the lower pulley groove cast into the damper. All of the March Performance pulley kits are made for the 3-hole damper that does NOT have the groove cast in. Mine is this one that is most common on the FE I think. It's a one sheave pulley pressed onto a rubber ring with the sheave cast in: None of the pulley kits are compatible with this one. I'd like to replace it because A: it has no timing marks like the one above. B: want to replace the warped steel water pump pulley, and dress up the front end a bit. I'm only running an alternator, no PS or AC. Which FE damper is March Performance and the other pulley kits makers talking about? The Ford part/casting # for the damper is C4AE-6316-A_08. There is one other for 360 and 390 FE's: D2TZ-6316-A: I'm guessing I need to press one of these on before I can use one of the March pulley kits. It looks like the only option. I may have answered my own question.
If you're planning on hitting the boneyards, you'll just have to hunt. Ford used both types (groove/no groove) across a pretty wide range of years starting in about '66, depending on the application. The only ones you have to watch out for are the 410 Merc/428 dampers, some of those have a different balance but it's unlikely you'll find one. But you can buy new ones easily; Summit has a bunch, from about $80 for a Dorman stock replacement on up.
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