[FrankM1]

I'm interested in a Superformance with a ROUSH 427, the valve covers are engraved with the following, 427R - 092.

I've seen other Roush 427 with different numbers on the valve covers, like 427R - 323, 427R - 242, it seems that every engine has a different number.

Could this be a serial number, or a code for different options?

Thanks,

Francis