Nothing to do with me (apart from they appeal to my engineering side), the site below has a few video clips of engines running with perspex cyclinder heads & rockerboxes
Our older readers may remember Colortune (a glass sparkplug so you could see what was happening inside your engine), these folk have taken it a stage further
Recommended for anyone with an interest in odd/quirky/weird engineering
speedsociety.com/this-glass-cylinder-head-on-a-briggs-engine-gives-a-great-visual/?source=ss
Our older readers may remember Colortune (a glass sparkplug so you could see what was happening inside your engine), these folk have taken it a stage further
Recommended for anyone with an interest in odd/quirky/weird engineering
speedsociety.com/this-glass-cylinder-head-on-a-briggs-engine-gives-a-great-visual/?source=ss