[392cobra]

Miles,
I first had a 2001-2002 crate FMS 392.
I had heard great things about the horsepower gain with a AFR switch,here on CC.I went and talked with them at Keith Craft in Plano about it.
I was told by them that the pistons would need to be flycut because of the bigger valves in the AFR.

Like what is being said here,others said it wasn't needed.

With that and rebalancing and no telling what else,I decided not to.
Later on I went with a KC 418". Great engine.