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For 1991, the 700R4 was renamed to the 4L60. The TBI (throttle body injection) system used on the Blazer's standard 5.7 liter V8 had longer throttle shaft bearings, new throttle return springs, and improved fuel mixture distribution. The 5.7 liter V8 also had new heavy-duty intake valves and powdered metal camshaft sprockets.
Throttle-body injection (TBI) was used on gas engines through 1995. Central point injection (CPI) was used on the 1996–2000 4.3 L, 5.0 L, and 5.7 L engines, while the 1996–2000 7.4 L V8 used sequential fuel injection (SFI).
The 267 was introduced in 1979 for the GM F-body (Camaro), G-body (Chevrolet Monte Carlo, El Camino), A-body (Malibu Classic, 1979–1981) and also used on GM B-body cars (Impala and Caprice models). The 4.4 L; 267.8 cu in (4,389 cc) engine had the 350's crankshaft stroke of 3.48 in (88.4 mm) and the smallest bore of any small-block, 3.5 in (88 ...
A unique intake manifold that used the 48 mm (1.9 in) twin-bore throttle body from the 5.7L TPI Corvette engine was used on the engine's top end. [9] The turbocharged 4.3 L (262 cu in) was last used in the GMC Typhoon in the 1993 model year. The engine produced 280 hp (209 kW) at 4400 rpm and 360 lb⋅ft (488 N⋅m) of torque at 3600 rpm.
For 1987, the four-barrel carburetor for the V6 was replaced by throttle-body fuel injection (TBI), with the 5.0L and 5.7L V8s following suit. Alongside three-speed and four-speed manual transmissions, the G-series vans were offered with three-speed and four-speed automatic transmissions.
Iron Dukes were fitted with fuel injection (TBI, via a single injector in the throttle body) in 1982. This version was christened the Tech IV, though Car and Driver later ridiculed it as the low-Tech IV. [citation needed] Power output increased to 90 hp (67 kW). [11]
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