Popping Under acceleration

[Phoenix6189]

Have a 2250 that blew a head gasket, after replacing the head their is a popping under acceleration now. Seems to be coming out the intake side. Worse of course with turbo pipes installed. Thought head may have had some bad valves so installed new cummins head. Same issue. Doing a cylinder cut off doesn't seem to change anything. Is demandated by member. Bought an injector to move around. No change. Checked Base timing and lash twice. Acts like it out of timing. Thinking Cam, but dont see anything obvious, but it ran fine before it went down. Cam has over 800,000 miles on it. 1.3 million on motor, cylinder height is .013. Motor and Injectors inframed 300,000 miles ago. Acts like Fuel or timing. Exhaust looks black and white, unburnt fuel.