Hello OF
My Smith hemi head has ran better in my opinion than any other I have ever ran.
The features of it are:
A- 1 piece as opposed to a 2 piece head, this makes for better heat transfer and stops the possibility of having the button turn and contacting the piston. I have seen this many times.
B- The FOX runs hot when your trying to get power out of it, The SHH has deeper cooling fins and also has extra fins cut around the outside edge of the head, this allows for more power and a faster dispation of the heat.
C- All of the SHH have a heat dam cut around the Glo plug to insult the heat in the plug , we need to run hot plugs to run a 4-2 cycle. The heat dam keeps the plug cleaner in the transitions and helps greatly in making the "burp" less pronounced , or in many cases stopping it.
D- The inside chamber is a hemi design that has just a small increase in compression over the stock one. It runs as smooth as possible while increasing 4 cycle power.
E- The Glo Plug is offset toward the exhaust side to help keep the plug a little hotter and cleaner. element end is canted back toward the center, Sort of like the way the old FOX 36 X was.
There are many hundreds if not now over a 1000 of FOXes running this head
All of the ones I have sold use this head , and 1oos of the Larry Foster Fox 35s were sent with this head also.
I would suggest also asking anyone , who has one, how they like it.
Maybe others who have ran these will chime in here also
Regards
Randy