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Spark plugs... R42TS vs. R43TS (AC Delco)

Posted by Kevin on 10/9/2009, 10:07 pm
75.118.24.211

My owner's manual indicates to use spark plug "AC" type R43TS (or equivalent). I know that in the early 90's, the industry did away with lettering and went to all numbers to ID spark plugs, but as we all know our Chevettes are from a time before that standard. Anyway, my question refers to the heat range. I already know that R stands for "resistor", TS for "tapered seat w/ extended tip", and the number 4 indicates 14mm treads. Am I asking for trouble using a "2" heat range when the factory called for a "3"? Or am I splitting hairs here? I have a whole box of AC Delco R42TS purchased years back and now want to know if they're close enough. Thanks for any insight!



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Message Thread: Spark plugs... R42TS vs. R43TS (AC Delco) - Kevin 10/9/2009, 10:07 pm Re: Spark plugs... R42TS vs. R43TS (AC Delco) - Andy B 10/10/2009, 6:43 am Re: Spark plugs... R42TS vs. R43TS (AC Delco) - Andy B 10/10/2009, 7:12 am Re: Spark plugs... R42TS vs. R43TS (AC Delco) - pete 10/10/2009, 10:11 am Re: Spark plugs... R42TS vs. R43TS (AC Delco) - Kevin 10/10/2009, 4:03 pm Re: Spark plugs... R42TS vs. R43TS (AC Delco) - Wayne 10/11/2009, 9:39 pm « Back to thread

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