340 Piston to valve clearance w/RHS heads

*EDIT...should say piston to HEAD clearance*


I'm in the process of procuring all the parts to build up my 340.

I'm starting with a 1970 340 with the forged crank, stock bushed rods, etc.

One of the big parts of my build will be the RHS LA-X heads from Brian at IMM. Since these are closed chamber, and as many of you know, the off the shelf pistons for 340's that are Forged are the TRW L2316F pistons, which tend to stick out 0.016-0.018" out of the hole.

I'm planning on replacing the rod and main bolts with ARP's, but other than that, it will be stock. I would like to run the 0.055" thick felpro gaskets (can't remember the PN), but this would give me around 0.037" piston to head clearance. Is this enough? I could order some cometics but they would be custom at 0.060", but I don't plan to get the block decked (its still within flatness specs and I don't need the pistons to stick out farther), and I'm somewhat concerned by their roughness spec.

Your thoughts?