JAK'S Diesel Performance Cylinder Heads are our own-brand line, built for trucks that earn their keep — running loaded, running hot, and stacking miles. These aren't shelf-stock replacements; they're the head you reach for when a stock casting keeps cracking under the same heavy-haul, high-EGT duty cycle that broke the last one.
The line spans multiple stages, from a clean OEM-spec replacement up to a full competition build, with higher stages stepping up to upgraded valve materials such as Inconel for better heat tolerance — and every head is backed by a serial-number warranty. Not sure which stage fits your engine and duty cycle? Get a quote and we'll match it to how you actually run.
Text a photo of the part tag — a specialist crosses it and quotes you fast.
