New 383 MAG Inboard 4V – a perfect repower for all Bertram 28, 31 & 35s

Finally, the perfect engine to replace a 5.7 litre or 7.4 litre classic inboard!

Not only is MerCruiser’s new 383 MAG Inboard 4V powerful and lightweight, it also comes

in standard and opposite rotation versions – making it an ideal repower option for many boat owners.

“For example, there are a lot of people with older 28, 31, 35 Bertrams who are still running their original, tired engines,” said David Meehan, Director of MerCruiser (Australia, New Zealand, Pacific).

“The 383 MAG Inboard is the perfect answer. It’ll be like having a new boat, guaranteed, at a lot less cost.”

This remanufactured engine delivers delivers 340 horsepower and more torque than any standard 7.4L big block.

And it does so while weighing some 70 kilograms less.

“It is compact as well, so it will fit into the existing engine bay without any costly engineering,” David said.

And the option of standard and opposite rotation versions means there’s no need to install a new transmission for twin engine applications.

The 383 MAG also has a full roller valve train which reduces friction and saves on fuel.

All MerCruiser Remanufactured engines come with a 1-year factory backed limited warranty.

Horsepower @ flywheel	340
Kilowatts @ flywheel	254
Maximum RPM (WOT)	4600-5000
Cylinders	Remanufactured GM V8 Marine Iron Block & Gen+ Heads – 062 Casting
Displacement (CID/L)	383 / 6.3
Bore & Stroke (in/mm)	4.03 x 3.75in 102 x 95mm
Compression Ratio	9.0:1 with Hypereutectic Pistons
Fuel Requirement	87 octane (R+M)/2
Engine Control System	Thunderbolt V w/Knock Control – MIE Calibration
Fuel Delivery System	4V carburettor and mechanical fuel pump
Fuel Injection System / Carburettor Type	750 cfm Weber 4V with electric choke
Induction System	Dual Plane Aluminium Intake Manifold with Bronze Inserts
Charging alternator amp	65
Charging alternator watt	917
Water drain system	Multi-point drain – Hand Removable Blue Drain Plugs
Exhaust System	Iron manifold with Dry-Joint Exhaust Elbow
Cooling System	Thermostatically Controlled Raw Water – 143F
Accessory Drive System	Serpentine belt
Lubrication System	High Flow 100 psi Oil Pump and Copper Oil Cooler
Recommended Oil	SAE 25-40 NMMA Certified FC-W Synthetic Blend
Rocker Arms	1.6:1 Full Roller Aluminium
Length (in/mm)	43in / 1092mm
Width (in/mm)	29in / 737mm
Height (in/mm)	22in / 559mm
Weight (lbs/kg)	980lbs / 444kg – When Installed with 72C Transmission
Features & Related Products	Audio Warning System: – Oil Pressure – Coolant Temperature – Transmission Temperature