1971 Chevelle Engine Horsepower & Torque Specifcations

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GM published both gross and net horsepower/torque ratings for 1971 in preparation for the net ratings in 1972. Gross ratings are shown here with (G) and net ratings with (N) for comparison.
Engine Specifications
Engine Type Cubic Inches Horsepower @ RPM Torque @ RPM
I6 250 (STD) 145 @ 4200 (G)
110 @ 3800 (N)		 230 @ 1600 (G)
185 @ 1600 (N)
V8 307 (STD) 200 @ 4600 (G)
140 @ 4400 (N)		 300 @ 2400 (G)
235 @ 2400 (N)
V8 350 (RPO L65) 245 @ 4800 (G)
165 @ 4000 (N)		 350 @ 2800 (G)
280 @ 2400 (N)
V8 350 (RPO L48) 270 @ 4800 (G)
175 @ 4000 (N)		 360 @ 3200 (G)
290 @ 2400 (N)
V8 402 (RPO LS3) 300 @ 4800 (G)
260 @ 4400 (N)		 400 @ 3200 (G)
345 @ 3200 (N)
V8 454 (RPO LS5) 365 @ 4800 (G)
285 @ 4000 (N)		 465 @ 3200 (G)
390 @ 3200 (N)