M5 Wont start after head gasket replacement

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M5 Wont start after head gasket replacement

steve	I replaced the head gaskets on my M5. When I put it back together I noticed that the motor was spinning faster and with less compression than before. When I removed the heads, I did not remove the push rods. I did however turn the motor over by hand while I was cleaning out the cylinders. The lifters are moving up and down and oil is flowing through the push rods. Valves are also opening and closing without issue. Could I have messed up the timing somehow?? TIA Steve
Shaun Wallace	Did you set valve lash when put back to gether?
steve	no I did not. I will have to better understand what that is before I move forward with this project. I am not a mechanic :) How do you think that this is related? (I sure don't understand it)
Shaun Wallace	Valve lash is gap between end of valve stem and rocker arm. When replacing head gkts the new are thicker or thinner than old witch changes lash. so if vales are open slitly leaks compression

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