[Strim91GT]

I've got the dss 393 rotating assembly. The crank that came in the kit was a scat steel crank. i'm not sure if it is anything like the 331 cranks or not, but mine had three half moon keys in it. The crank didn't come with the half moon keys in mine. I called up DSS and asked what size they were and they told me they were a custom keyway, but if they needed some they went down to the nearest car quest and got some, so it's not a custom keyway. BUT, the ones in my scat steel crank 393 DSS kit were small block chevy size. i'm assuming that's so you can get offset keys and play with the timing some. But i went to the nearest auto parts store and got small block chevy half moon keys. AND if you want to, just get a keyway that's to big and take it to the grinder to grind it down to make it fit better..... Just my 2 cents. Good luck