Cylinder heads - shop reccomendations

[PrezeS_PL]

I need to get heads checked out for cracks (coolant in the oil) in my chevy diesel.
I phoned those places and was wondering if anybody has any experience with them or could recommend another shop.

Bilt-Rite Cylinder Head Service

Head Masters Cylinder Head Service Inc.

Firebolt Engine

[freakin]

I deal with percise for all of my Honda stuff and have been very happy. I'm sure they could handle some pushrod heads with the same results.