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Old 08-16-2009, 01:59 PM
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LifeofReiley LifeofReiley is offline
 
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Default 37BY Spark Plugs
I read a post somewhere in the last month stating 37BY plugs were Iridium. Anybody know about this fact or maybe saw the same post? Is this really true?
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Old 08-16-2009, 02:03 PM
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-37BY is the "reach" and "heat range" of the plug. It may or may not be iridium. I've been running -37BYs for many years, but I don't run iridium.
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Old 08-16-2009, 02:08 PM
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Hi Mel,

I just found the answer... 37BY's are not iridium, (S) plugs are. I'm running
37BY's on the bottom mag side and they work very well. I'm not spending $80.00 a plug that's for sure. Might add another LS EI.

http://www.aircraftspruce.com/catalo...psprkplugs.php
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