Im new here but i have a b20 z2 motor in a 91 integra and my timingbelt broke when i was going uo a hill took it to the shop and they told me i have bent valves in 1 cylinder so instead of changing the valves i baught another head witch is a p75 head and bolted it up to the block i set the timing and it wont start advanced the timing and it still wont start so i ran a compression test and 1&2 cylinders have no compression #3 cylinder has around 145 compression and #4 cylinder has like 85-95 compression could it be that the head i bought the valves are sticky or no good please help or is my timing completly off to were it has no compression please help thanks

 

welcome to the forum. When you did your compression check, you should have heard air leaking from the intake or the exhaust side. also if it were 1&2 the head gasket could be leaking into each other. or wrong headgasket for different head to block.