Cylinder Heads: The Key to Horsepower

In this episode of the Power Driven Diesel Podcast, Will, Myer, and Todd dive deep into everything cylinder heads—what makes them tick, what causes head gasket failure, and how to make serious horsepower. Whether you're just trying to keep a head gasket sealed or chasing four-digit horsepower, this episode covers it all. The guys break down the real differences between head stud materials, head bolts, O-rings, and fire rings, and share hard-earned knowledge from years of testing, tuning, and racing. Todd shares dyno stories and real-world examples, while Will and Myer go full nerd on airflow, valve spring pressures, fire ring groove design, and why coefficient of discharge actually matters. The team discusses the myth: “boost blows head gaskets” and they then explain why torque is the real head gasket killer. You’ll hear about their CNC porting journey, how they’re pulling huge gains from factory castings, and why a properly ported head is one of the only upgrades with no downsides—more power, better spool, improved drivability. Whether you're building a street truck, tow pig, or race rig, this episode is your one-stop-shop for understanding the top side of your engine and how to make it bulletproof.