DIY Motorcycle Engine Flow Bench

This engine flow bench is based on the design presented by pingu393, see link below. My original flow bench had a problem of air cavitation when I simulated valves closed. But when I simulated cracking the valve open my manometer went the wrong direction and indicated MORE suction. The design by pingu393 solved this issue so I took his design and pared it down to a more manageable, streamlined tool.
• Build Your Own Flow Bench
Key Words: Engine tuning, Port and polish, Head porting. Motorcycle 4-stroke
Music- "Access Time" by Sound Idea