Q: Why am I losing compression on cylinder #4 on my 2006 Mazda 6

I bought a block that needed a piston,the block honed and resurfaced after hitting a valve in the cylinder head. I had all of that work done as well as getting all of the bearings and piston rings replaced. I used another head that was warped,had it resurfaced, a three angle valve job and had the valve stem seals replaced from the same machine shop. Replaced all gaskets including the head gasket and timing components. After reassembling the engine using torque specs the engine has a very hard time starting and shuts off after a few seconds. During start up you can hear and feel air being pushed out from the front right of the engine near the intake manifold. A compression test confirmed a leak in cylinder four. There is no oil leaking from the head gasket at all where the sound of the air/compression leak is coming from. If not the intake, could that great amount of compression still be lost between the head and block without oil and after being machined and checked as good to go?