Monterey 318SS 2008 boat specs
Monterey
Monterey 318SS 2008
2008
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VS
Monterey M4 2020 boat specs
Monterey
Monterey M4 2020
2020
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Monterey 318SS 2008 vs Monterey M4 2020: Same Brand, Different Boat

The Monterey 318SS 2008 vs Monterey M4 2020 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.

Size is the most obvious dividing line here. The Monterey 318SS 2008 measures 31,0 feet overall (2008), giving it roughly 7,9 additional feet of deck space compared to the Monterey M4 2020 at 23,1 feet (2020). Weight tells a clearer story for trailering families: the Monterey 318SS 2008 tips the scales at 8 000 lbs - 3 500 lbs more than the Monterey M4 2020 at 4 500 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

Both boats share a closely matched power ceiling - 320 hp for the Monterey 318SS 2008 and 300 hp for the Monterey M4 2020. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Monterey 318SS 2008 carries 142 gallons versus 50 gallons in the Monterey M4 2020. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

For family outings this is probably the sharpest distinction between the two. The Monterey 318SS 2008 is rated for 9 passengers, while the Monterey M4 2020 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Monterey 318SS 2008 could be the deciding factor.

Bottom line: Choose the Monterey 318SS 2008 if your priority is putting more people on the water - it handles 9 passengers and at 31,0 ft it has the deck room to back that rating up comfortably. The Monterey M4 2020 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.
General Boat Info
MakeMonterey
Makenot available
Model318SS
Modelnot available
Model Year2008
Model Yearnot available
Measurements / Dimensions
Beam9 ft. 6 in. (2.9 m)
Beam8.60 ft
Beam - Meters2.9
Beam - Meters2.62
Beam - Inches114
Beam - Inches103
Deadrise22°
Deadrisenot available
Weight - Detail8,000 lbs. (3,629 kg)
Weight - Detailnot available
Weight - kg3628.74
Weight - kgnot available
Weight - lbs.8000
Weight - lbs.not available
Length - Meters9.7
Length - Metersnot available
Length - Feet31
Length - Feet23.1
Length - Inches10
Length - Inchesnot available
Length overall - Detail31 ft. 10 in. (9.7 m)
Length overall - Detail23.10 ft
Length overall - Meters9.7
Length overall - Meters7.04
Length overall - Inches382
Length overall - Inches277
Draft [max] - Detailnot available
Draft [max] - Detail3.60 ft
Draft [max] - Metersnot available
Draft [max] - Meters1.1
Draft [max] - Inchesnot available
Draft [max] - Inches43
Draft Minnot available
Draft Min2.20 ft
Displacementnot available
Displacement4500.00 lbs
Body / Hull
Hull materialFiberglass
Hull materialnot available
Hull typeDeep Vee
Hull typenot available
Engine and Drivetrain
Engine/s standardTwin Volvo 5.0 l GXI DP 270 hp
Engine/s standardnot available
Fuel tank capacity - Detail142 gal. (538 l)
Fuel tank capacity - Detailnot available
Fuel tank capacity - Liters537.53
Fuel tank capacity - Liters189.27
Fuel tank capacity - Gal142
Fuel tank capacity - Gal50
Fuel typeGas
Fuel typenot available
Drive typeInboard - Twin
Drive typeinboard
Engine maxTwin 320 hp (Twin 239 kW)
Engine maxnot available
Horsepowernot available
Horsepower300 hp
Engine 2 Engine Makenot available
Engine 2 Engine MakeVOLVO PENTA
Engine 2 Horsepowernot available
Engine 2 Horsepower380 hp
Engine 2 Drive Typenot available
Engine 2 Drive Typeinboard
Operational Info
Water capacity15 gal. (57 l)
Water capacity10
Holding tank capacity - Detail18 gal. (68 l)
Holding tank capacity - Detailnot available
Holding tank capacity - Liters68.14
Holding tank capacity - Litersnot available
Holding tank capacity - Gal18
Holding tank capacity - Galnot available
Headnot available
Head1
Boat typenot available
Boat typePower

Monterey 318SS 2008 vs Monterey M4 2020 - Common Questions

Which is the larger boat - the Monterey 318SS 2008 or the Monterey M4 2020?
The Monterey 318SS 2008 is the longer of the two at 31,0 feet overall. The Monterey M4 2020 comes in at 23,1 feet, making it roughly 7,9 ft shorter - a meaningful difference in deck room and overall on-water presence.
Which is easier to trailer - the Monterey 318SS 2008 or the Monterey M4 2020?
For trailering, the Monterey M4 2020 has the edge at 4 500 lbs dry weight versus 8 000 lbs for the Monterey 318SS 2008. Add a motor (typically 300–500 lbs for an outboard in this class), gear, and a partial fuel load and the difference grows. Lighter is friendlier on smaller tow vehicles and on fuel economy while hauling.
Which boat can handle a bigger outboard?
The Monterey 318SS 2008 is rated to a maximum of 320 hp, giving it the larger power ceiling. The Monterey M4 2020 tops out at 300 hp. Keep in mind that maximum ratings are just that - matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.
How many people can each boat hold?
The Monterey 318SS 2008 is Coast Guard rated for 9 passengers, while the Monterey M4 2020 is certified for 7. Note that legal capacity and comfortable capacity aren't always the same thing - on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.
Which boat is wider, and does it affect trailering?
The Monterey 318SS 2008 measures 114" wide, compared to 103" for the Monterey M4 2020. The US standard-width towing limit is 8’6" (102") in most states - anything over that may need a wide-load permit. Confirm your specific route requirements with each state's DOT.
Which boat has the larger fuel tank - the Monterey 318SS 2008 or the Monterey M4 2020?
The Monterey 318SS 2008 has the bigger tank at 142 gallons, versus 50 gallons on the Monterey M4 2020. That 92-gallon difference translates to roughly 276–460 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.
Are the Monterey 318SS 2008 and Monterey M4 2020 from the same manufacturer?
Yes - both the Monterey 318SS 2008 and the Monterey M4 2020 are built by Monterey. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.