If the cylinder heads are on the engine, you will need to add air pressure to the cylinder to hold the valves in place. Our example is the Craftsman 47089 compression test kit using the 14mm long ...

Obviously, these valve-control-related issues, associated with insufficient valvespring pressure, are the reason why camshaft manufacturers offer valvespring upgrades. The obvious answer might seem to ...

In the quest for performance for your LS1-equipped Firebird or GTO, the road to big-power increases usually progresses from bolt-ons into "Cam-Only" configurations, such as those presented in "LS1 ...