Replacement Heat Exchanger Tanks - MerCruiser

MerCruiser Heat Exchanger BBC

Replacement for Mercuiser 807400A1 Big Block GM (Chevy) 7.4-Liter, Late Model Front Mount (Mounted over engine water circulating pump). Sterndrive and Inboard Engine applications.

MerCruiser Heat Exchanger Conversion Kit

• Upgrade from 3" Diameter to 4" Diameter Heat Exchanger Body for Mercruiser 3.7-Liter, 224 cu.in. Model 170, 470 4-Cylinder Aluminum Block Engine
• Mercruiser replacment, upgrades older 3" heat exchanger to newer more efficient 4" heat exchanger.
• Replaces Mercruiser Kit Number 41525A1
• NOTE: Kit is supplied with attaching hardware to use with your existing 3" mounting brackets on engine to support new 4" heat exchanger

Mercruiser Heat Exchanger for GM 8.2L Single Tank Design. Overall length is 21 3/4" Diameter 4” Replaces Mercruiser OEM part #18390T

Make sure to verify this is the correct tank as we’ve found most people think they need the 18390T unit which is 4" x 22". However they normally have it confused with the 805136T.

Mercruiser Heat Exchanger. The unit is 19" Overall length, 5" Lower Tank, 4" Upper Tank 1-1/2" fitting fresh water to water pump 1-1/4" sea water inlet and outlet 1" Upper Tank Fittings. Replaces Mercruiser OEM part #61084

Mercruiser Inboard Big Block Heat Exchanger Diameter 5” x 21” OAL. Replaces Mercruiser OEM part #44446 Fits Mercruiser GM big blocks.