How do you create a beam pocket in an ICF wall? We need them along straight runs, size about 4" wide x 12" high by all of the depth of the 6" core inside. Wood block clad in rigid foam? Plain wood block? Release agent to enable easier block wreckout? Got pictures? YouTube videos?

Cut them all after pour. Just an idea,

Rigid foam is usually easier. Easier to cut and shape and fasten. Make sure to consolidate well around (and under) the form

I made a wooden form, but it was a chore to get out. If I did it again, I'd probably use rigid foam, maybe wrapped in plastic.

I used some galvanized sheet metal, snips, seamers, and pop rivets to make boxes. Some attached plywood kept them from floating out. I thought it made them easier to position more precisely before and then to find them after the pour, than using the glue in pour stop inserts that some foam block manufacturers stock. Much cleaner too !

Why not embed the beam prior to pour and cast concrete right around it? It requires temporary support until concrete is placed but its done and ready for you to continue as soon as the pour is completed.

If that is not an option, use scraps of ICF and create the pocket, cut them out after the pour, the base is never perfect so make them a 1/2" lower than needed, mix some grout and get the pocket to the right height and level, place your beam and your done.

I wouldn't recommend cutting it in after concrete is poured. Solid wood blocking is difficult to get out - plywood box/EPS is much easier.

A good form oil for ICF is Pam Cooking Spray - will not eat away the EPS.

It is a crawlspace application and we don't care about coming inside with some exposed 'crete. Here is what we think we will do. Pretty quick and easy. Well, that didn't work. Anybody know how to attach pics to these posts?

What you posted pics of is a pilaster, not a beam pocket. The pic you posted is correct, you will however need a rebar detail, generally 4 - #5's with a closed stirrup, generally #4's @ 8-12" o.c. along with additional dowels from the footing.