[Half Kit] - MERC SBC 1999-up Marine Closed Cooling Kit.

Short description:
Mercruiser Closed Cooling [Half Kit] Small Blocks years 1999-present

New Chevy Small Block (4.3L, 5.0L, 5.7L, 6.2L) Marine Fresh Water Cooling Kit (Fits Mercruiser apps years 1999-present)

You are looking at a Brand New freshwater cooling kit for Mercruiser applications years 1999-present. This kit will fit 4.3L, 5.0L, 5.7L and 6.2L marine applications. This is a "half kit" (i.e. this cools only the engine block). On average, this kit will take 1-2 hours for installation. This kit comes with everything needed for installation. Nothing more will be needed. If you are unsure if this will fit your application, please email us a serial number off of your application (ex. 0F123456)


Will this kit fit my application? Here are some specs:

  • Will fit Mercruiser applications years 1999-present
  • Fits small block GM engines (4.3L, 5.0L, 5.7L, 6.2L)
  • Half Kit (cools block only)
  • Fits only Serpentine (single belt) setups
  • Designed for applications that have the alternator mounted high on the starboard side and power steering pump mounted low on port side
  • Reference MFH-5433 when calling


Installation Instructions


Please note that the shipping cost listed in this ad is for shipping to the continental USA by FedEx Ground or Home Delivery. If you are located oustide of the USA or in Alaska, Hawaii, or Puerto Rico, pelase contact us for a shipping quote before you buy.


-We Ship Worldwide!-


Detailed Description of Kit

1999 - present MerCruiser GM 4.3L, 5.0L, 5.7L, and 6.2L (262, 305, 350, and 377 CID) models with a single serpentine belt/single-belt (will NOT fit v-belt or multi-belt equipped engines).   Sterndrive and inboard (EXCEPT V-drive installations).   For sterndrive applications, the power steering pump should be mounted low on the port side and alternator on the upper starboard side ( For engines with the power steering mounted high on the port side and serpentine belt order kit MFH-5229 or MFH-5398).   For inboard applications, the alternator should be located on the lower starboard side of the engine.   Heat exchanger is 4-1/8" diameter x 21" long and fits within overall length, width, and height of most engine conversions (adds 1-1/2 to overall length of 2001 and newer MPI installations).   Heat exchanger extends from extreme starboard side of a normal exhaust manifold towards port.   Plastic expansion tank mounts either on front of heat exchanger or if space is limited on vertical surface next to engine.

This kit is a block only fresh water cooling [FWC] system; meaning that only the engine block is protected by the system.   Exhaust elbows and exhaust manifolds remain on the raw water system.   System utilizes a unique, high performance heat exchanger. Our FWC systems are specially designed for the low capacity raw water pumps used on sterndrive engines. 

Kit includes heat exchanger, heavy-duty translucent plastic expansion tank, complete instructions, and all other components necessary to convert a raw water cooled engine to FWC.   Some existing water hoses and hose clamps are reused.   Heat exchanger, thermostat housing and mounting brackets are finished in black.   Fasteners are zinc/cadmium plated or stainless steel.   All hose clamps are 3XX series stainless steel.

High-flow, shell and tube design allowing a higher cooling capacity than standard.   All copper alloy construction made to the highest industry standards.   Includes heavy-duty, dual, demountable end covers for easy clean-out.

Will maintain coolant temperatures in the 160-170  F range using 160  F thermostat included in kit.   System has cooling capacity safety margin higher than industry standards.

Heaters such as galley water heaters and cabin heaters are easily connected to the system by utilizing the cooling system bypass connections. 

Average installation time is approximately 2-3 hours, assuming new engine and normal accessibility.   Allow additional time for filling and testing. Installation skills are typical of most do-it-yourself boat owners.   Complete illustrated installation instructions are included in kit.

Two year warranty.


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