[ted]

The 4.125" or 4.250" Scat cranks physically fit fine in the 390 but be aware that they do so using BBC rods. The rod journals are smaller than the Fe which pulls in the rod overall dimension which in turn allows the rods to clear the camshaft.

The only issue I have with the Scat cranks for the stroker Fe's is having to add heavy metal to them using balancing bobweight numbers that would normally support having to remove metal. Just looking at the cranks, the end crankshaft counterweights appear to be slightly undersized compared to standard cranks although the Scat cranks have lightening holes in each of the rod journals. Of course, I'm internally balancing everything. I'd hate to see what the heavy metal bill would be using TRW/Federal Mogul slugs instead of the lightweight pistons I'm using.