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2. Volvo Redblock Engine - Wikipedia

   en.wikipedia.org/wiki/Volvo_Redblock_Engine

   Also new for the 1981 model year in Canada (previously introduced in 1979 outside of North America) was the B23, with a displacement of 2.3 litres (80 mm (3.15 in) stroke and 96 mm (3.78 in) bore). Aside from the increased bore size, the engine is identical to the B21.

3. Stuffing box - Wikipedia

   en.wikipedia.org/wiki/Stuffing_box

   The stuffing box prevents water from entering the boat's hull. In many small fiberglass boats, for example, the stuffing box is mounted inboard near the point the shaft exits the hull . The "box" is a cylindrical assembly, typically of bronze, comprising a sleeve threaded on one end to accept adjusting and locking nuts.

4. Chevrolet small-block engine (first- and second-generation)

   en.wikipedia.org/wiki/Chevrolet_small-block...

   It has a 4.125-inch (104.8 mm) bore and a 3.750-inch (95.25 mm) stroke. The 400 differed from other small-blocks in that the cylinders were siamesed and therefore required 'steam' holes in the block, head gaskets, and heads to help alleviate 'hot-spots' in the cooling system at the point above the siamesed cylinders.

5. Multi-valve - Wikipedia

   en.wikipedia.org/wiki/Multi-valve

   A cylinder head of a four valve Nissan VQ engine engine. A multi-valve or multivalve engine is one where each cylinder has more than two valves (an intake, and an exhaust).A multi-valve engine has better breathing, and with more smaller valves (having less mass in motion) may be able to operate at higher revolutions per minute (RPM) than a two-valve engine, delivering more power.

6. Mercury Marine - Wikipedia

   en.wikipedia.org/wiki/Mercury_Marine

   Later that year the Kiekhaefer Mercury company designed a new inline 6-cylinder, 60 cubic inch, 60 hp (45 kW) engine named "Mark 75". Like its 2- and 4-cylinder brethren, the Mark 75 featured internal reed valves. The reed valve blocks served as intermediate main bearings.

7. Universal Atomic 4 - Wikipedia

   en.wikipedia.org/wiki/Universal_Atomic_4

   A Universal Atomic 4, installed in a C&C 29 Mark 1 sailboat. The Universal Atomic 4 is a four-cylinder, gasoline engine produced by the Universal Motor Company between 1949 [1] and 1984 for use as auxiliary power on sailboats. [2] Both 18 horsepower (13 kW) and 30 horsepower (22 kW) versions of the engine were produced. [3]