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The 4.3 L (262 cu in) also used larger valves than the 229 cu in (3.8 L) V6, with a 1.94-inch (49.3 mm) intake valve and a 1 + 1 ⁄ 2-inch (38.1 mm) exhaust valve (also shared with the 350). [ 2 ] In 1986 and 1987, the 4.3 L (262 cu in) engine saw engine design upgrades similar to the Chevrolet small block V8.
When Kiekhaefer Mercury's top-of-the-line, 80 horsepower (74 cubic inch) model "Merc 800" was introduced for 1960, direct reversing as standard equipment was optionally replaced by full forward, neutral and reverse gear shifting, as on Mercury's 2- and 4-cylinder models, and "thru-hub" exhaust was introduced.
The engine was revised in 1995 and thereafter referred to as a 4.0 to differentiate it from the earlier version, although displacement was unchanged. The revisions consisted of a new intake and exhaust system, extra block ribbing, revised pistons, and larger cross-bolted main bearings. The 1995 4.0 produced 190 hp (142 kW; 193 PS) and 236 lb⋅ ...
It used solid lifters, 11.0:1 compression, the "178" high-performance camshaft, and a 780 cu ft/min (22 m 3 /min) vacuum secondary Holley four-barrel carburetor on a special high-rise aluminum intake, with special 2.5" outlet rams' horn exhaust manifolds in the Corvette, Delco transistor ignition and a low-restriction exhaust factory rated at ...
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It was its own separate engine design, based on a single block casting, [19] which had four exhaust manifolds, two carburetors and intake manifolds, and two distributor caps driven by a single distributor drive, [19] plus other parts from the 351 V6. A total of 56 major parts are interchangeable between the Twin-Six and the other GMC V6 engines ...
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