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Several significant changes were made in 1987, which included: an improved cylinder head, intake manifold, and throttle-body fuel injection module; a more-modern serpentine belt with an automatic spring-loaded tensioner for the accessories; and a Distributorless Ignition System (DIS). This revision to the engine increased power to 98 hp (73 kW).
The 1980s also saw Holley's entrance into the fuel injection market where OEM EFI components and analog Pro-Jection retrofit fuel-injection systems for carbureted cars were introduced. In the early 1990s Holley continued new product introductions with the HP Pro Series race-ready carburetors.
This version of the 4.3 L (262 cu in) was equipped with CPI (Central Port Fuel Injection). This system had one centrally-located fuel injector to distribute fuel to six hoses each with a poppet valve to each of the intake ports. This system allowed for a multi-point fuel injection, using one injector. The fuel injection was a batch fire system ...
Throttle-body fuel injection became available on the 1980 Lincoln Continental, and became standard on all non-H.O. 5.0 engines for 1983. For the 1986 model year, Ford replaced the throttle-body system with sequential multi-port fuel injection, identifiable by the large intake with an "EFI 5.0" badge on top.
This was Chevrolet's second 4.3L power plant; four other Chevrolet engines displaced 4.3L: the Vortec 4300 (a V6 based on the Chevrolet 350 cu in (5.7 L), with two cylinders removed), the original 265 cu in (4.3 L) V8 in 1954, a bored version of the stovebolt-era 235 inline six displacing 261 cu in (4.3 L), and a derivative of the Generation II ...
Engines with manifold injection, and an electronic engine control unit are often referred to as engines with electronic fuel injection (EFI). Typically, EFI engines have an engine map built into discrete electronic components, such as read-only memory. This is both more reliable and more precise than a three-dimensional cam.
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