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Old 08-20-2006, 08:54 PM
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AC Delco Spark Plug Number Help

Hello - could someone help me decipher how AC Delco plugs are numbered? For example - an MR43LTS plug - I know the M stands for Marine, and am guessing the R is a resistor style, but what about the L, T, and S? It looks like an extended tip plug. If anyone knows of a website that breaks down the numbering scheme for different brands that would be great too. Thanks for your time. Jim

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Old 08-20-2006, 09:14 PM
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http://www.acdelco.com/parts/sparkpl...tification.htm
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Old 08-21-2006, 07:26 AM
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Thanks for the link kane583 - was just what I was looking for.

Now another question - are these a bad idea for a run of the mill SBC? Looks like the heat range is correct, but being a long extended tip would they be a lot hotter then a standard 43? I was going to thread one into a spare head tonight and see how far it projects into the combustion chamber.
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