Direct replacement for the Mercruiser heat exchanger 863903 (4" diameter version).
Dimensions: 4" diameter x 22" long (20" bundle).
Fits Mercury Mercruiser Chevy 496 Engine.
Note there is also a 3.5" diameter version: MEC 863903 3.5.
This product will normally ship in 7 days.
This is a non-OEM, aftermarket part MEC 863903 4.
Collections: MERCRUISER HEAT EXCHANGERS & COOLERS