wristpin
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- 1,177
These guys have taken the Colourtune see through spark plug to a new level.
http://speedsociety.com/this-glass-cylinder-head-on-a-briggs-engine-gives-a-great-visual/?source=ss
http://speedsociety.com/this-glass-cylinder-head-on-a-briggs-engine-gives-a-great-visual/?source=ss