The Giants met the Pirates in 1971 in their first ever NLCS. It was just best 3 out of 5 then. The Giants took the first game 5-4 but the Pirates won the next three 9-4, 2-1 and 9-5, then went on to beat the Orioles in the World Series. The Pirates' stars were Roberto Clemente and Willie Stargell. The Giants had a roster full of future hall of famers; Mays, McCovey, Marichal and Perry, as well as many other fine players such as Bobby Bonds, Dave Kingman, Chris Speier and Tito Fuentes.
I was there at Candlestick for game two, Sunday, October 3rd, and got to see fucking Bob Robertson hit three homers.