Need a replacement long block?
Mercruiser has some of the finest new and remanufactured partial engine assemblies in the marine industry. Email us your engine serial number along with your zip code and we will send you a quote.
Long Block Cross Reference Chart
Long blocks include: Engine block, crankshaft, connecting rods, pistons, rings, engine bearings, oil pump, marine gaskets,
marine camshaft, lifters, timing components, brass freeze plugs, complete cyl heads, timing cover, oil pan,
valve covers, marine circulation water pump, and one year Warranty.
New long blocks include flywheel and harmonic balancer. Some include new intake manifolds (see chart).
Remanufactured long blocks DO NOT include intake, flywheel, balancer or gasket sets.
Remanufactured Pro-Series
Perhaps one of the best remanufactured long blocks in the industry. Includes factory one year limited Warranty.
Remanufactured Platinum-Series
These factory remans include NEW cylinder heads, NEW valves, springs, guides, keepers and seals.
The Platinum-Series also includes a fantastic 2-Year limited factory Warranty.
Model Litre/CID/ Cyl. Year Range Serial # Range New Long Block P/N New P/N Status Reman. Pro Series P/N Reman. Platinum Series P/N
110 2.5L 153 CID I/L 4 1963 - 1966 (1537370-2044033) 87956A1 N.L.A. N.L.A. N/A
120 2.5L 153 CID I/L 4 1964 - 1986 (1537370-OB531853) 87956A1 N.L.A. N.L.A. N/A
2.5L 2.5L 153 CID I/L 4 1987 - 1989 (0B531854-OC853255) 87956A1 N.L.A. N.L.A. N/A
496 Mag & 8.1S 8.1L 496 CID V-8 2001 and newer (0M025000 and up) 865752A01 Active 863815R5 N/A
496 Mag HO & 8.1S HO 8.1L 496 CID V-8 2001 and newer (0M025000 and up) 865754A01 Active 863817R5 N/A