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nthdrt
03-29-2011, 12:34 PM
any ideas on what spark plugs to use on a hobbystock 9-1 motor with 76cc heads? I have a set of 882 and 441 heads

Dirtman29
03-29-2011, 03:01 PM
Autolite racing plugs, 5/8" plugs AR12 or AR13, or 13/16" plugs AR72 or AR73, the higher # the hotter the plug. I (think) the 12s & 72s are the coolest temp. wise.

nthdrt
03-29-2011, 03:53 PM
whats the differance between a hot or cold plug

nthdrt
03-30-2011, 03:56 PM
Thanks dirtman29

gadirtracer
03-31-2011, 12:08 AM
Autolite AR133.