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Originally Posted by fish4stripers
Hi,
Sorry to high jack this thread. Considering changing my plugs, can someone tell me the right plugs for 1992 300E m103. I have beru wires and have changed one resistor end that was arcing but never took the plug out so not sure what's in there.
Thanks, Jeff
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They're listed in your owners manual - Bosch Super (conventional copper core) H9DC0 (OE) heavy duty electrode or Bosch Super H9DC conventional electrode. You probably won't find either at McParts but both are readily available from Fastlane, and I recommend the standard electrode H9DC, which are about two bucks each.
McParts may have HR9DC, but the "R" indicates a resistor plug, which you DO NOT want.
In fact, Pep Boys has Bosch Supers on sale for a buck each, so I'm going to pick up a set or two of HR9DC for my Cosworth Vega, which uses the same geometry/heat range as M103, BUT in a conventional resistor type. I already inquired if Pep Boys can get H9DC. They could not even special order them.
Duke