I have a big case fox Stunt .40 with two rings machined on the head that I bought from Big Art.

Herman

  Yeah, Randy, anyone know who that might be?

    Brett

   Yep,   I think i have been cutting those for about  ummm 30 years  now   

Randy

Randy, is the number of ring cut in the head "code" for anything or just decorative? Reason I ask is that some of the engines you worked for me have two rings, others have only one. Just curious.

Hi Clint

No , No code and it is never decorative. In order to make power engines generate heat, you need to disspell this heat quickly, the extra grooves  give more area to help cool the engine. The  groove, or "heatdam" cut around the glo plug helps to keep the only part of the heat you want to run hot, hot. Glo plugs run cleaner if they don't run cool, Aluminum heats act as a heatsink and pull heat from the plug, The heatdam machined around the glo plug just helps to keep a little more heat in the glo plug resulting in a cleaner run by making the plug hotter. Really nothing I do to engines is decorative, Except maybe the anodized ones, but,even the hundreds of anodized engines Ive done also is for cooling as there is evidence that it can help cooling

Regards
Randy