Which Chevy 4.3 Was Carbureted?
Chevrolet produced two distinct versions of the 4.3-liter engine: the groundbreaking small-block carbureted V-8 and the fuel-injected V-6. The V-8 displaced 265 cubic inches and was commonly called the 265. It was the first in a long line of small-block V-8 engines. The 4.3-liter V-6 was derived from the small-block V-8. The V-6 had the same basic architecture as the 265 and 350 V-8 engines, but with two cylinders shaved off the engine.
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Original 4.3
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Chevrolet introduced the 265-cubic V-8 in 1955 to boost sales of the Corvette, which was saddled with an inadequate in-line six-cylinder engine. The 265 V-8’s output ranged from 162 to 195 horsepower. The debut version of the 265 featured a two- or four-barrel carburetor. The two-barrel version featured an 8-to-1 compression ratio and developed 162 horsepower and 257 foot-pounds of torque. The four-barrel 265 had the same compression ratio and generated 180 horsepower and 260 foot-pounds of torque. Corvette’s four-barrel 265 featured the maximum 195-horsepower output. Later 265 versions featured higher compression ratios up to 9.25-to-1 and matched with automatic or manual transmissions. In 1956, buyers could order the Corvette with twin four-barrel carbs that generated 225 horsepower and 270 foot-pounds of torque.
Reduced by Two
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The small-block V-8 was a profound success for Chevrolet and led to the 283, 327, 350 engines. The 350 emerged as the perfect solution to providing maximum horsepower in a compact and light engine. However, by the mid-1970s, Chevy began scouting around for an even smaller power plant that delivered horsepower at the same level as the small-block V-8. Chevrolet developed a 200-cubic-inch V-6 based on the 265, and later boosted the cubic-inch displacement to 229. Chevy hit on the right formula in 1985 with the 4.3-liter V-6 that displaced 262 cubic inches. The new V-6 featured the same components as the small-block V-8, but with the No. 6 and No. 3 cylinders removed. Still, it had the same bolt pattern and rear block face of the V-8.
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TBI 4.3
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The V-8’s offspring, the 4.3-liter V-6, arrived in 1985. Chevrolet never produced it with a carburetor for its passenger cars, and instead gave it the new engine indirect throttle body fuel injection, or TBI. However, Chevy equipped its 4.3-liter V-6 in 1985 with the Quadrajet carburetor in vans and light trucks. Watercraft equipped with the 4.3-liter engine also received the Quadrajet carb. By 1987, all 4.3 V-6 engines received TBI. The original TBI 4.3 versions generated 160 horsepower and 230 foot-pounds of torque. They had a 9.3-to-1 compression ratio.
Multi-Port Injection
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By 1993, Chevy equipped its vehicles with the multi-port fuel injected 4.3-liter V-6. It developed 195 horsepower and 260 foot-pounds of torque. Many of its components came from performance engines, such as powder metal connecting rods, roller rockers and a composite intake manifold. For a brief period in 1992 and 1993, the rare GMC Syclone and Typhoon all-wheel drive sport utility vehicles came with a multi-port fuel-injected intercooled turbocharged 4.3-liter V-6. It developed 280 horsepower and 350 foot-pounds of torque. It had an 8.35-to-1 compression ratio.
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