6.4L 392 HEMI BIG GAS CNC Ported Heads by Modern Muscle

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:

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 application. 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). Of note are the differences in the valves. The Modern Muscle valves are a custom proprietary valve with a thicker cross section for higher horsepower applications. The intake valves are a stainless high-temp hollow stem valve, and the exhaust valves are solid type premium stainless alloy. These Modern Muscle valves are used in 1500+ horsepower turbo applications.