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Depends on which 350 it has. One has about 240 hp and another engine offered in 71 was a 270 horsepower 350. With an exhuast and the mild cam I would place it give or take around 20-25 hp more than the original stats. Headers would be a big gain with the aftermarket exhaust.
165
not sure of the horsepower but you will gain about 10 more horse with a 4 bbl.
If that's a 360 - 4 barrel ( 170 horsepower / 160 horsepower in California ) Actually the E58 360 4 barrel with dual exhaust was rated at 195 HP! I own one!
The first generation Chevolet Chevelle SS was produced from 1963-1964. It had a 283-cubic-inch four barrel v8 engine with 220 horsepower. It was priced at US$1,501.
Depends on carb and exhaust setup. If it's a four barrel with dual exhaust and not one of the stage 1 options than it has 230 horsepower and 355 lb-ft of torque. Amusingly enough, a two barrel setup has as much power as a four barrel 350 (little more torque though).
Advertised horsepower is..........165HP @ 3800 RPMs. 4-barrel Carb. You may gain another 2 HP with duel exhaust. but not much.
160 horsepower - 2 barrel carburetor 180 horsepower - 4 barrel carburetor
1970. While the 350 was never the base engine for the Chevelle, 2 and 4 barrel versions of the 350 were available in the Chevelle from 1970-1977.
Straight 6 = single barrel rochester. V8=either a rochester 2 barrel, or quadrajet.
190 Horsepower.
145 if it has a 2 barrel, 165 with the 4 barrel.