correct 478 spark plug
howdy
I've got a 478 in a bus. I rebuilt it years ago and have always had a dieseling problem when I shut it off. if you shut it off when it's cold or after start up it's OK. but if you let it run awhile it diesels. it's a 478 magnum. early no taper seat plugs and it's idling at 500 rpm. it's got ac r43xl plugs in it 3/4" reach
I haven't tried any other plugs but I read dieseling can be caused by too hot a plug
any help on what should be in there?
steve
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