I agree totally on the NGK plugs. I am not sure about their ( NGK’s) nomenclature , but the platinum / rhodium tip is for sure worth the significant money . If engine is otherwise good , 100k miles not out of question and much wider effective heat range —without problems — than older more limited heat range plug designs .
I had used Bosch dual ground electrode before that , also good, cheaper $ , but not 100k material .. I did that after noticing the single ground electrode is often burned back causing a wider gap , so two grounds is good . Just me . Their nomenclature really confuses, a “quad “ Bosch plug ( marketing) has two grounds I think . Check .
Maybe the fiberglass end sleeves sold specifically for race header plug wire protection by places like Jeg’s help the accidental burning of the wires? It seems to happen a lot on ram cars . Careful shaping dressing and retaining of wires too .
Plugs must be spotless on insulators and I believe in silicone up in the fitting . A common place for arc over on all mopars is at the coil tower if at all dirty . Arc will come out under the HV wire boot ,jumping to one of the terminal screws . Look in there on a dark damp night .. I had an erratic skip on a brand new 68 charger 383 , 4 trips to dealer new plugs etc . Found it myself one dark rainy night . You can see it snapping . Cleaning and silicone grease fixed it .
Sent from my iPhone
On 7 Oct 2018, at 3:03 pm, Noel Hastalis cpaviper@xxxxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
Posted by: John Grady <jkg@xxxxxxxxxxxxxxxxx>
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