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CP Performance Boaters Shopping and Product Info Guide
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Hardin Marine Xtreme Series Crossover Cooling Systems

hardin marine logoA crossover cooling system provides the optimum method upon which to allow an engines inlet cooling water to enter the engine by eliminating the excessive drag caused by the circulating pump cooling system. Removal of the circulating pump offers potential power gains due to the elimination of this drag. Hardin Marine offers the finest and broadest selection of crossover cooling systems found anywhere.

These water crossovers are CNC machined from 6061-T6 billet aluminum and have a black hard coat anodized finish that protects them from the harshly corrosive salt water environment. They are completely O-ringed on all sealing surfaces which eliminates the need for sealing gaskets. The billet aluminum covers are also O-ring sealed and are polished to a mirror finish or can be custom color finished by the customer. Available with a single center inlet 90 degree 1-1/4" NPT fitting or with dual side entry 1" NPT inlets. The popular 90 degree center inlet style is lower profile than previous models and prevents interference with blower belts. The inlet can be indexed or clocked to different positions in order to accommodate water inlet hose routing. All covers are available with power steering mounting ears to be used in conjunction with the Hardin Marine crossover mounted power steering pump. Inlet hose barb fittings are available separately. These units fit all popular B/B GM type engines.

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Dual Inlet Standard Crossover
Dual Inlet Standard Crossover

This is the standard dual inlet crossover featuring independent 1" NPT inlets for a broad range of plumbing applications.

  • CNC machined from 6061-T6 billet aluminum
  • These units fit all popular B/B GM type engines.
  • Inlet hose barb fittings are available separately.
  • Dual side entry 1" NPT inlets.
  • O-ringed on all sealing surfaces (eliminated the need for sealing gaskets).
  • Polished to a mirror finish or can be custom color finished by the customer.
  • Inlet hose barb fitting sold separately.
Part No. Description
625-4380 Dual Inlet Standard Crossover
Dual Inlet Crossover With Power Steering Mount
dual inlet power steering crossover

This version of our dual inlet crossover offers the provision to incorporate a power steering pump mounted to the crossover.  This is the ultimate dual inlet configuration and eliminates the need for any additional power steering bracketry.

  • CNC machined from 6061-T6 billet aluminum.
  • Eliminates the need for any additional power steering brackets.
  • These units fit all popular B/B GM type engines.
  • Features power steering mounting ears to be used in conjunction with the Hardin Marine crossover mounted power steering pump.
  • Inlet hose barb fittings are available separately.
  • Dual 1" NPT inlets.
  • Includes mounting bolts.
  • O-ringed on all sealing surfaces (eliminated the need for sealing gaskets).
  • Polished to a mirror finish or can be custom color finished by the customer.
Part No. Description
625-4382 Dual Inlet Standard Crossover With Power Steering Mount
Single Inlet 1-1/4" Crossover
single inlet crossover

This is the standard version of our single inlet crossover. These units feature a single 90 degree 1-1/4" hose barb. The inlet is a lower profile design than previous versions preventing interference with supercharger belts. The inlet can be clocked or indexed to different positions accommodating various water inlet hose routing.

Part No. Description
625-4370 Single Inlet 1-1/4" Hose Barb Crossover

Single Inlet Crossover With Power Steering Pump Mount
single inlet crossover

This version of our popular crossover features both low profile swivel 1-1/4" hose barb provision and also a power steering pump mounting provision making it the ultimate single inlet crossover available anywhere.

Part No. Description
625-4372 Single Inlet Crossover With Power Steering Pump Mount