2002 6.0L Vortec V8 - Hydro locked Cylinder #4 & Excess gas in #6

[n4hmr]

I recently posted the title 'Issues Replacing the Injectors in a 2002 Chevy Silverado 3500 Cab/Chassis Truck' in the 1999-2013 Silverado & Sierra 1500 forum, subforum Active Fuel management.

 

6.0L Vortec V8.  Brief description.  Found a hydro locked #4 cylinder and excess gas in #6. 

Worried about how the gas got into cyl #6.  Two defective injectors or could the hydrolock condition damage a head gasket with gas leaking into the adjacent cylinder?

No evidence of excess gas in cylinder #2.

 

Would a compression check give a clue for this?

 

Please review my other post for more info.

 

Thanks