Harley davidson spark plug selection a few general comments about selecting spark plugs by heat range spark plugs do not make heata hot plug cannot make your motor overheat although it can cause other problems if it is not the correct heat range for your motor. Below is a cross reference list of spark plugs for use in most harley models while the motor company only recommends use of their original equipment harley brand spark plugs the other brands often exceed original specification and will not void your warranty. We offer the latest technology in spark plug design performance that can help you improve your engine performance fuel economy call us at 713 459 6977 harley davidson spark plug application guide application information. Autolite spark plug heat range is generally indicated by the last digit of the part number higher number indicate hot plug for example 5 or 4 and low number indicate cold heat range for example 1 or spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. About us holleyr has been the undisputed leader in fuel systems for over 100 years holley carburetors powered every monster energy nascarr cup team and nearly every nhrar pro stock champion for four decades
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