Why don't we list or sell any aftermarket valve covers? Because we use and recommend the factory VW covers with the stock bail system. All others we have seen come loose and/or leak. People often tell us of engine failures from this problem with aftermarket covers, specifically the bolt on ones. Because we have no problems clearing the stock covers with our properly made ratio rocker arms, there is no need to re-invent the wheel. When bolt on covers are used, the head heats up and the torque goes up on the bolt, over tightening the cover to the gasket. This compresses the gasket more. When the head cools off the torque is reduced on the bolt and the gasket cannot recover from the compression. After a few times of this, the bolt will be loose when cold and not reach the torque to make up for the loss in gasket thickness and you get a leak or even a bolt that falls off. Simply put, use the factory stock covers and bails. |