Over 10 Rear Wheel HP Gains! This LT1 water pump has proven Mezieres reliability with customers logging 50,000 to 60,000 miles on their daily drivers. For many, the economical price and longevity make it a logical choice over the factory replacement. Along with the horsepower savings, the relocated seal drain eliminates the possibility of a pump leak causing optispark failure. The need for the heavy and expensive factory timing chain is also eliminated. Some Camaro/Firebird (F-bodies) may require trimming of the fan shroud. No inlet required.