Short Spark Plugs For Header Clearance?

[67 B-body]

A plugs heat range is specificaly stating how easily it transfers heat away from itself. That's it, nothing more..... Typicaly the higher the number in a series of plugs, the hotter it is or, the more it holds the built up heat from combustion. A series or group of plugs normaly indicates something specific like shell dia, length, etc. An example would be autolite 83, 84, 85, 86 listed from cool to hot in heat ranges. Once again, it's just how efficient the spark plug is at dissapating it's own heat built by combustion.

 

[oldbee]

Nope,won't work. Plug heat range is related to combustion chamber temp. I always went a heat range or two hotter when firing up a new/rebuilt engine; so as not to worry about oil-fouling,etc.Heat range on plugs is more related as to how fast the plug gets rid of chamber heat that travels up it's length.Jeez, it's been 40 yrs. since I worried about this stuff!!!!!!!!!I'm in to big truck diesels now.

 

[67 B-body]

Nope,won't work. Plug heat range is related to combustion chamber temp. I always went a heat range or two hotter when firing up a new/rebuilt engine; so as not to worry about oil-fouling,etc.Heat range on plugs is more related as to how fast the plug gets rid of chamber heat that travels up it's length.Jeez, it's been 40 yrs. since I worried about this stuff!!!!!!!!!I'm in to big truck diesels now.

The plug DOES NOT get rid of "chamber heat". The plug is heated BY "chamber heat", and it disipates heat through its shell into the cyl head. zzie and the spide