Compared to the 392 Apache head, the Hellcat head looks very similar, but the Hellcat heads are cast at a specialty low volume using Hellcat specific tooling. The Apache head is a 319 alloy while the Hellcat head is a premium heat-treated 356-T6 alloy, giving it higher thermal conductivity and improved elongation (one of the measures of an alloy’s strength).
The following are some improved features of Hellcat heads over the Apache heads:
Better material for boost
Increased stiffness for boost
Improved water jacket design over any previous head design for higher power levels
Custom CNC porting by Modern Muscle Performance
Multi angle valve job, and blended
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