Image Part No. I want to swap out my plugs,freshen up the engine.I want to ask the flathead experts about running NGK B6L as opposed to The B4L which is a hotter spark.Is there any problems with running a hotter plug.My flathead is a 50 8BA with two holley 94s,mallory magnetic breakerless ignition,and offy heads,with 1800miles on a rebuild.The NGK are 14mm and their reach is 0.4375,will … Plug images are located on the opposite page. Starting with part # IK20 (heat range 20), a colder plug would be # IK22, a hotter plug would be # IK16. The manual recommends NGK BKR6E plugs. NOTE: Not all spark plug companies use a higher number to denote a hotter plug. If you read up on current spec sheets from plug manufacturers they say with modern fuels in classic engines to go one grade hotter than specified by manufacturer literature. NGK 6619 Iridium IX Spark Plugs snagged the top pick in our spark plug comparison because they offered the best mix of high-performance, fuel efficiency, durability, and dependability. However, for NGK, the higher the number, the colder the plug. Let’s make this really simple: when you need your engine to run a little cooler, run a colder plug. Engine temperature will affect a spark plug's operating temperature, but not the plug's heat range. Doc . For Champion, higher numbers are hotter. See cross reference chart for NGK D7EA and more than 80.000 other spark plugs. Stock No. Hotter plugs are listed above the colder plugs. My mechanic says that the plugs are fine, but wikipedia says that they might cause detonation. Starting with part # BKR6E-11 (heat range 6), a colder plug would # BKR7E-11 (heat range 7), a hotter plug would be # BKR5E-11 (heat range 5). NGK plugs are colder the higher the number, hotter the lower the number. ngk spark plug upgrade chart original plug stock no. The figure 7 represents the heat range of the plug. iridium upgrade stock no. The inside of a spark plug is less than exciting—so stay out of there. (The number after the “-“ is the gap.) Any use of this cross reference is done at the installers risk. However, NGK strongly cautions people that going to a hotter spark plug can sometimes mask a serious symptom of another problem that can lead to engine damage. George Colgett
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