MSD Ignition Iridium Spark Plug Heat Range: 4
121-37204
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5/8" Hex Tapered Seat
Specifications:
How many come in package
What is the over all length,? I'm using AC Delco R46TS and that plug is as shorter than R45TS and the heat range seems ok, (can't find the R46TS plugs) I'm looking at accel shorty design, My ignition system is all MSD except the plugs.
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