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315 cu. in. 350, 355.11595, 360.42273. 400, 406.77494, 412.1771. 454, 460.39267, 466.86937. *RPO stands for Regular.... Looking for official 454 engine specs? See what we discovered about this Chevrolet Big Block engine. Before you build this 390 hp engine, read this first.. Aug 28, 2018 I can find all kinds of specs on 454's from 81-86, 87-95 but the 70's truck ... The 1979 Chevrolet 454 cubic-inch V8 produced 245 horsepower at...