Section 4 - Specifications
Page 60 90-864195070 JUNE 2007
Models 4.3 MPI 5.0 MPI 350 MAG MPI
350 MAG MPI
Horizon
MX 6.2 MPI
MX 6.2 MPI
Horizon
Horsepower 220 260 300 320
Kilowatts 164 194 224 238
Number of cylinders 6 8 8 8
Displacement 4.3 L (262 cid) 5.0 L (305 cid) 5.7 L (350 cid) 6.2 L (377 cid)
Bore and Stroke
101.6 × 88.39 mm
(4.012 × 3.48 in.)
94.89 × 88.39 mm
(3.735 × 3.48 in.)
101.6 × 88.39 mm
(4.00 × 3.48 in.)
101.6 × 95.25 mm
(4.00 × 3.75 in.)
Compression ratio 9.2:1 9.4:1 9.4:1 9.0:1
Idle RPM in neutral 600
Specified WOT RPM range 4400‑4800 4600‑5000 4800‑5200 4800‑5200
Minimum oil pressure @ idle 41 kPa (6 psi)
Thermostat (seawater cooled
models)
71° C (160° F)
Thermostat (closed cooled
models)
77° C (170° F)
Timing @ idle Not Adjustable
Firing order 1‑6‑5‑4‑3‑2 1‑8‑4‑3‑6‑5‑7‑2
Electrical system 12‑Volt Negative (‑) Ground
Alternator rating 65 amp
Recommended battery rating
(Non‑DTS models) (minimum)
750 CCA, 950 MCA, or 180 Ah
Recommended battery rating
(DTS models) (minimum)
800 CCA, 1000 MCA, or 190 Ah
Spark plug type AC Platinum (AC 41‑993)
Spark plug gap 1.5 mm (0.060 in.)
Fluid Specifications (MPI)
Fluid Specifications
IMPORTANT: All capacities are approximate fluid measures.
Engine
IMPORTANT: It may be necessary to adjust oil levels depending on installation angle and
cooling systems (heat exchanger and fluid lines).
Always use the dipstick to determine the exact quantity of oil or fluid required.
4.3L MPI Models Capacity Fluid Type
Engine oil (with filter) 3.8 liters (4 U.S. qt.)
Mercury/Quicksilver Synthetic Blend
MerCruiser Engine Oil 25W‑40
Seawater cooling system (winterization use
only)
20 liters (21 U.S. qt.) Propylene Glycol and Purified Water
Closed cooling system 19 liters (20 U.S. qt.)
Mercury Extended Life Coolant/
Antifreeze or Extended Life Ethylene
Glycol 5/100 Coolant/Antifreeze mixed
50/50 with Purified Water
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