If you’re a company that makes aftermarket cylinder heads for Detroit’s most recent powerhouses, you’ve found yourself in a bit of a pickle in recent years, as mass flow rates for OE cylinder heads have skyrocketed in a race for improved efficiency. Driven by the EPA, today’s Detroit-built V8s are wringing a lot more work from a gallon of gas than we ever predicted. A perfect example of this is the third-generation Hemi V8, which even in its most diminutive form, offers port flow exceeding that of the most powerful big-block V8s of the 1960s.
This has been a boon to Mopar hot rodders, who can simply clean and refurbish their existing OE Hemi cylinder
