Car was running great then started to miss and knock then shut down. It re-started still missed and knocked. Had it towed took timeing pan cover of belt ok, timing marks right, pulled valve pan cover liffters all move, pulled plugs, pistons all move, no compression in #1 and 2, #3 and 4 have 40lbs now now I'm lost

 

cracked head or bad head gasket sounds more like a cracked head when it warms up the crack opens up an it losses what compression it had

 

Thank You!!!!!!!! The head gasket was blown between 3 and 4 again thank you

 

glad to hear its just a gasket not the head