• Constructed of 316L Stainless Steel.
• Fits BBC applications.
• 1" NPT inlet water crossover (allowing you to use a number of assorted fittings to adapt to your application).
• Includes bolts and gaskets.

• Constructed of 316L stainless steel and billet aluminum.
• Offers a optional cooling system bypass port as well as a single inlet.
• Includes pulley for 454/502 Mag applications.
• This model ONLY fits 454/502
• Other models available for popular HP Mercury engines including the 500, 525, 600, and 700's.
• O-ring sealed, no gaskets required.
• Includes mounting bolts.
• Multiple plumbing options from three 1" NPT ports.
• Includes one 1" NPT x 1-1/4" Hose fitting and two 1" NPT pipe plugs.
• Allows for the removal of the factory power robbing circulating pump.

Big Block Chevy Crossover Gasket - Sold in Pairs

Whether you're building a new power plant for your boat or you're like many and are ready to step from the stone age of traditional V-Belts to the modern long lasting and quiet operation of serpentine style drive system then Hardin Marine has the ultimate solution.  Serpentine systems are available in either a crossover water inlet style or the factory circulating pump version.  The comes complete with sea pump as well as a factory style circulating water pump (if called for), a 94 amp high-output chrome alternator, specially valved power steering pump, all billet brackets and mounts as well as stunningly polished precision CNC machined drive pulleys and matching idlers.  The kit will also include the correct mounting hardware and serpentine drive belt for the smoothest of installations.  Hardin Marine is leading the way with the latest in boating technology.

If your application requires a bypass, you will have to drill and tap a hole as shown in this drawing.

Whether you're building a new power plant for your boat or you're like many and are ready to step from the stone age of traditional V-Belts to the modern long lasting and quiet operation of serpentine style drive system then Hardin Marine has the ultimate solution.  Serpentine systems are available in either a crossover water inlet style or the factory circulating pump version.  The comes complete with sea pump as well as a factory style circulating water pump (if called for), a 94 amp high-output chrome alternator, specially valved power steering pump, all billet brackets and mounts as well as stunningly polished precision CNC machined drive pulleys and matching idlers.  The kit will also include the correct mounting hardware and serpentine drive belt for the smoothest of installations.  Hardin Marine is leading the way with the latest in boating technology. These drive kits version do not include the power steering assembly.

• Eliminate your power robbing circulating pump!
• Constructed of 316L stainless steel.
• One large 1" bypass hose for increased water volume.
• Includes 142 degree thermostat.
• Includes Crossover, Thermostat housing, 142 degree thermostat, hose with clamps, bolts & gaskets.

• Constructed of 316L stainless steel and billet aluminum water crossover.
• Offers a optional cooling system bypass port as well as a single inlet.
• No pulley included.
• Kits available for all popular HP Mercury engines including the 500, 525, 600, and 700's.
• O-ring sealed, no gaskets required.
• Includes mounting bolts.
• Multiple plumbing options from three 1" NPT ports.
• Includes one 1" NPT x 1-1/4" Hose fitting and two 1" NPT pipe plugs.
• Allows for the removal of the factory power robbing circulating pump.