A coil-on-plug ignition system was introduced. This engine was still in production in 2013, even though the distributor had stopped in the early 2000s. Another main upgrade occurred in 1992 to allow the installation of a balance shaft in the block. New center bolt valve covers and hydraulic roller lifters were introduced in 1987. The 4.3L V6 is one of the most successful engines among other Chevrolet 90-degree V6 engines.Ĭhevy 4.3L V6 engines were upgraded in 19, with a one-piece rear main crankshaft oil seal replacing the two-piece one. The 4.3L V6 engine also has larger valves, with the intake valve measuring 1.94 inches and the exhaust valve 1.5 inches. Its crankshaft has a 30-degree offset between each rod pin with a much larger rod journal of 2.25 inches. The 4.3L V6 engine has a 4-inch bore and 3.48-inch stroke, the same as the 5.7L Chevy V8 engine. The engine’s displacement is 4,300 cubic centimeters (263.3 cubic inches) and boasted 155 hp when it first appeared. It first featured in 1985 and was given the numerical number 4300. The 4.3L V6 is one of the most successful engines among other Chevrolet 90-degree V6 engines. 4 Summary 4.3L V6 (4.3 Vortec) Firing Order and Cylinder Numbers 4.3L V6 Engine Overview.3 3.3L V6 Firing Order and Cylinder Numbers.2 3.8L V6 Firing Order and Cylinder Numbers.1 4.3L V6 (4.3 Vortec) Firing Order and Cylinder Numbers.
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