Specifically designed to take advantage of low capacity stern drive water pumps. Readily adaptable to cabin heaters. Prolongs engine life immeasurably using 50-50 anti-freeze mixture rather than corrosive raw or salt water. The furnished zinc anode helps control electrolysis and galvanic corrosion. Greatly simplifies winterizing with peace of mind assurance that you are much better protected. Greatly improves engine and fuel efficiency through even temperatures throughout the engine like GM intended it to operate. Fits 1986 thru 1995 and may be adaptable to more. Detailed instructions are included. Average installation time is about 4 hours depending on tools and expertise. This particular kit cools the engine only. Carb, serpentine belt, 2002 thru 2006.