Adding AFR185's to FMS392

[cleandan]

It depends on what your engine is exactly as compared to what "they" said would fit.
If your 392 is running uncut flat tops with zero deck and your current heads have smallish valves then yes, you will have clearance issues with the AFR's.
If you are running a street atyle comp ratio, say 9:1, with valve reliefs in the pistons to fit larger valves then you may have no fitment issues.
The real story comes from trying them on your motor, or at least one head for clearance fit trial. This IS a bit of a pain, but you will know for certain if you do a clay mold clearance test.
If you know your deck, your piston part numbers and if anything custom was done to them, your current valve size, and the lift/duration of your cam, and how it was installed (advances/retarded) you can get a very close approximation, but nothing beats clay clearance trials.

[ERA-FIA]

Mark, I installed AFR 205's on a FMS 392 (is that what you have) and there was more valve clearance than I expected. The valve pockets were large enough for the intake (2.08") vlave.

[Mark Brye]

Yes, I have the FMS 392 with the stock GT40X heads. I am not sure what all the specs of the motor are. I know that the X heads have 1.94x1.60 valves in them. I am not sure what pistons or cam Ford puts into the FMS Stroker. Mine is a 2006 build of the motor I think, so it would have the newer forged pistons.
I would never had thought that the AFR205's would have fit. Guess I will look into those instead of the AFR185's.

[ERA-FIA]

Mark, I did have an earlier version prior to the forged pistons, so you should still check the valve pocket size currently in use.