**3-5 week lead time**
When comparing this head to other aftermarket heads you MUST compare the standard features that we feel are necessary given what they are intended to be used for. We assume when a customer is looking to purchase a cylinder head at this level, nothing but premium parts are to be used. When comparing to other available heads please note that this head comes standard with:
Features:
- Premium Alloy Steel Guides
- Solid Manley 2.140 Stainless Steel Intake Valves
- Solid Manley 1.654 Stainless Steel Valves
- MMX Tool Steel Retainers (Prefered choice over titanium for strength and wear)
- PSI 1516 Beehive Design Spring Capable of 650 Lift
- All Heads Surfaced and Quench Cut
Compared to the 392 Apache head, the 6.4L HEMI Big Gas cylinder head looks very similar, but the these heads are cast using specific tooling designed for heavy duty applications. The Apache head is a 319 alloy while the HEMI Big Gas 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 HEMI Big Gas 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
- MMX Hand Blending
We do not recommend this head or any other head of this valve size or bigger purchased for a small bore application (5.7L or 5.7L based strokers).
6.4L 392 HEMI BIG GAS CNC Ported Heads by Modern Muscle fits the following vehicle(s):
6.1L and 6.4L HEMI Based Engines
