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GM's 4.3L V-6 was intro'd in 1985 as a cut-down version of the 350 (5.7L) V-8. Over the years, the engine has been refined and beefed from its original 155 hp at 4,000 and 230 lb-ft at 2,400 (with a four-barrel carb) to the 190-horse, central-port fuel-injected ('93-'96) or sequential multiport-injected ('97-and-up) screamer it is today. A revamp in 1993 added advanced Vortec heads, an internally balanced crankshaft, and other performance enhancements. The mill and spare parts are plentiful and reasonably priced.