Fleece Performance 04.5-05 GM Duramax LLY Cylinder Head (Driver Side) LML 100% Drop in Ready

100% Drop in Ready

4L engines

5') 13578389 & 13578388

the X-TRA Cool Radiators feature internally reinforced end tubes and construction techniques to provide additional strength at the outside corners where the core is most vulnerable

Fleece Performance 04.5-05 GM Duramax LLY Cylinder Head (Driver Side) LML 100% Drop in ReadyIntroducing our Freedom Series cylinder heads for the 6. 6L Duramax! Each cylinder head is manufactured in our state of the art Freedom Racing Engine shop and is guaranteed to meet or exceed factory specifications. All heads are meticulously inspected, pressure and leak tested, and are equipped with new valve guides, springs, and valve seals. Perfect for the daily driver or towing application, these heads utilize stock valves with a 45 degree angle on