MMR's cooling head mod ( HCM ) for for 96-04 DOHC 4.6/5.4 (ALL Heads) - (rear of heads) is designed to help eliminate hotspots in the #8 cylinder by promoting coolant flow around cylinder # 8 - the cylinder long known to be the first to detonate with aggressive naturally aspirated tunes and forced induction and suffer from the dreaded tick caused by overheated and worn valve guides. Dont fall victim to this failure, protect your investment with this simple, professional kit. Installation requires Knocking out the Driver Side factory freeze plug and removing the factory black heater tube and replacing it with the MMR fittings and simply installing the MMR kit. Kit seals with high grade DOUBLE Viton Brand Aerospace O rings (included). NHRA Approved Socketless hose does not require hose clamps for simple push on installation. Includes all parts shown, no other parts required.
*Perfect for Street and Full race use
*Double O ring for a perfect seal
*Helps Prevent Hotspots in rear cylinders
*O ring seal & bolt in design cannot leak or fall out like factory freeze plugs
*Can be used for Plumbing dry decked cylinder heads on race applications
*Available with Std Rubber Hose or Black Braided Hose (see option box below)