Typical normal-service engine valve-train components may be too lightweight for operating at high revolutions per minute (RPM), leading to valve float.  This occurs when the action of the valve no longer completely opens or closes, such as when the valve spring force is insufficient to close the valve (it does not fully rest on its seat even though the cam would allow the valve to close) causing a loss of control of the valvetrain, as well as a drop in power output.  Valve float will damage the valvetrain over time, and could cause the valve to be damaged as it is still partially open while the piston comes to the top of its stroke.  Upgrading to high pressure valve springs could allow higher valvetrain speeds, but this would also overload the valvetrain components and cause excessive and costly wear. 
Tren- great medication, which gives excellent results on the path of "solo" to increase muscle mass without the need to be combined with other medications. However, it is a very powerful steroid, and therefore do not exceed the recommended dosage of certain: for acetate - is 50mg per day for enthatate: 300-350mg per week. To test the tolerance of Tren is better to start with a minimum dosage. If the entire rate is not more than six weeks, the need for additional formulations appears; when 6 to 8 weeks, with the need to enter the second week Gonadotropin (500 / 1000ME every 7 days) and stop taking it two weeks after administration cycle. Next, we have to be post-cycle therapy: start 14 days after the last injection or after 3days (if used Tren Acetate). To restore testosterone production take testosterone boosters (4 weeks after the course).