bogateer

While inventorying my spare parts collection I came across a couple of 5-fin .049 glow plugs. What are these and what are they used for as compared to the "normal" glow plugs? I also found some "high-compression" plugs. Generally speaking how many copper washes need to be used with these? I seem to recal it's more than one and why would this be...if you wanthigh-compression why would you increase cylinder volume by adding washers?)

Thanks!,

Rob