Don't drop the valve!

Why is assembling a cylinder head so incredibly dangerous?! 🚀⚙️
Inside an engine, massive steel valve springs hold back hundreds of pounds of extreme pressure to keep the combustion chamber sealed! During a rebuild, mechanics have to forcefully compress these heavy-duty springs to lock them onto the valves. If a tool slips during this process, the heavy spring will violently launch across the garage like a loaded weapon!
In this intense engine assembly video, a professional mechanic uses a specialized overhead compression tool to safely push down the heavy steel spring retainer! While the spring is fully compressed, they place their bare fingers directly into the danger zone to seat the two microscopic metal keepers onto the valve stem! Watch until the very end to find out the fatal mistake that will drop a valve and instantly destroy your engine!