I am looking for all of the choices in heat range for spark plugs for the 289 4V high compression engine. I will try to usethem in a dyno run and check for detonation. Thanks in advance...
Dominic
I am looking for all of the choices in heat range for spark plugs for the 289 4V high compression engine. I will try to usethem in a dyno run and check for detonation. Thanks in advance...
Dominic
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