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Custom engine builds

Get every last bit of horsepower out of your engine

With our state-of-the-art SuperFlow SF-902 Engine Dyno, your engine performance will be thoroughly tuned for peak performance saving you future headaches and expensive repair bills. All motors J & J Marine build are run, tested, and broken in before being shipped or installed.

Engines now available for sale

Top quality work from our Mercury, Johnson, and Evinrude certified technicians

Call today for all your boating repair and service needs

If you don't see the cubic inch or horsepower level that you want, just give us a call and we'll put a package together that will make a great impression out on the water.

- 496CID, 520/575HP

- Aspirated 540 CID, 615 HP

- Aspirated 540 CID, 655 HP

- Aspirated 555CID/700HP EFI/Carb

- Aspirated 600CID/800HP EFI/Carb

- Aspirated 632CID/875HP EFI

- Aspirated 632CID/1000HP EFI

- Supercharged 1100 EFI

- Supercharged 1250/1450 EFI

Exceptional knowledge and experience

QUALITY WORK

IS OUR

PASSION

MORE THAN 60 YEARS

OF COMBINED EXPERIENCE

Look no further for a team of engine repair professionals who can tackle any boat engine problem. Count on us to work with only top quality work from our Mercury, Johnson, and Evinrude certified technicians with only the most modern equipment and repair techniques.

This engine is the biggest secret in MerCruiser's engine line up.  It is rated at 440HP from MerCruiser, but what they don't mention is that it is rated at 4600 rpm.  The reason they had to limit the horsepower rating on this engine is because, if they rated it at what it really makes, it would fall into the MerCruiser Racing line of engines.  This would mean a different pricing level, along with being restricted to MerCruiser Racing Dealers only, instead of being available to all MerCruiser dealers.  The engine does have a factory rev limiter set at 4600 rpm, so if more power isn't necessary for you,  just leave it be. However, to unlock the true potential of this engine, we can supply you with the 5200 rpm ignition module which takes this engine OVER 500 horsepower -- 520 horsepower to be exact -- and BIG torque.  Add anaftermarket exhaust, and pick up another 30 horses!!!!

J&J MARINE IS THE “MOST EXPERIENCED”

AND THE “ONLY ENGINE SPECIALIST”

 

CALL US TODAY 856-228-4744

WE ARE YOUR ENGINE SPECIALISTS

WE ALSO OFFER MERCRUISER FACTORY REPOWER “FINANCING” ON THE

ENGINE PICTURED BELOW AS WELL AS MANY OTHERS TO SELECT FROM

 

AND/OR

 

You Can Choose To Finance Your Entire Engine Package

(RIGGING, GAUGES, CONTROLS AND LABOR)

MerCruiser OEM (540 c.i.) Mag Bravo 4V

ENGINE

IN THE TRI-STATE AREA THAT RUNS AND CHECKS ALL ENGINES

WE INSTALL ON OUR SUPERFLOW 902 DYNO FOR ALL OF OUR CUSTOMERS

J&J Marine knows this because we put one of these on our SuperFlow Engine Dyno. After building countless 540CID engines and knowing how easy it is to get 600hp out of one (even with stock rectangular port heads, which is exactly what this motor has), we could not fathom this motor only making 440hp.  We knew the compression is on the low side, but it just did not add up.  So when one of our customers ordered one, we placed it on the dyno before installing it.  That is when we realized it had a 4600rpm limiter. After one call to our MerCruiser rep, he let us know the deal and gave us the part number for the 5200rpm module.  This motor is 100% complete!! A true plug and play with a warranty.

 

So if you want MerCruiser Racing Performance without the MerCruiser Racing price tag,  along with a 1 year warranty (3 year available), this is the engine for you!!!

 

FEATURES:

Single-Plane Intake

800cfm Holley Carburetor

4340 Crankshaft

Forged Pistons

Manley Valves, and Inconel Valve Seats along with the Racing Oil Cooler and Thermostat.

 

HP / KW @ Flywheel 440 / 4600 Maximum RPM (WOT)

Engine Type 8.9L Mercury V-8 Iron Block & Remanufactured Heads

Displacement (CID/L) 540 / 8.9

Bore and Stroke 4.50 x 4.25" / 114 x 108 MM

Compression Ratio 8.6:1 with Forged Pistons

 

Fuel Requirement 87 Octane (R+M)/2

Fuel Delivery System Holley 800 CFM Electric Choke Carburetor, Mechanical Fuel Pump

Air Induction Single-Plane Aluminum Intake with Bronze Crossover and Pads

Ignition Thunderbolt V with Knock Control

Alternator Amp / Watt 65 Amp / 917 Watt

 

Water Drain System Multi-Point Drain - Hand Removable Blue Drain Plugs

Exhaust System Iron Manifolds with 4" / 102 MM Diameter 316 Stainless Steel Dry Joint Exhaust Elbows

Cooling system Thermostatically Controlled Raw Water - 143F

 

Accessory Drive System Serpentine Belt

Lubrication System High Flow Oil Pump, Copper Oil Cooler, Oil Thermostat

 

Recommended Oil SAE 25W-50 FC-W Synthetic Blend Racing Oil

Engine Guardian System

High Coolant Temperature

Low Drive Lubricant

Low Oil Pressure

Complete Engine Package           $16,995