spark plugs?

[tundra]

just curious,would anyone know whats the deal with these different types of plugs and which ones
would be better to run, c7hsa which is described as standard type - c6hsa hot - c8hsa cold.
what's the difference between all of it?

[Shaka]

Those are all the same plug as far as thread size and length of protrusion.  The only difference between them is the temperature.  The lower the number the hotter the plug.  This really has to do with the depth of the ring between the center electrode and the outer casing, if you were looking into the end of it.  The hotter plugs have a deeper recess in this area which makes the contact area between the center of the plug and the outside threaded part smaller.  This allows for less heat transfer from the plug to the cylinder head, making it a hotter running plug. 

If you were running properly with your previous plug there is no need to change the temp.  It will only mess up your carb settings and possibly run too lean = very bad!!!  This link has some more info on plug heat range.

http://www.ngk.com/charglossary.asp?kw=Heat+range

[tundra]

Shaka..........THANK YOU! THANK YOU! THANK YOU!
Tundra.