327 Engine Specsby Don Patton
Chevrolet produced the 327 engine for eight years during the 1960s. It was one of the many incarnations of the popular small block V-8 Chevy made for more than 50 years. Different versions of the engine were available in vehicles ranging from Corvettes to trucks, and the specifications changed somewhat from year to year. All of them achieved 327 cubic inches of displacement from a 4-inch cylinder bore and a 3.25-inch stroke.
1962 to 1963
Chevrolet introduced the 327 engine on the 1962 Corvette by enlarging the cylinders of the 283-cubic inch, small-block V-8. The highest power output came from a fuel-injected model, and the rest each had a single four-barrel carburetor. The compression ratios ranged from 10.5:1 and 11.5:1. The four engines developed 250 hp at 4,400 rpm with 350 ft-lbs. of torque at 2,800 rpm; 300 hp at 5,000 rpm and 360 ft-lbs. at 3,200 rpm; 340 hp at 6,000 rpm and 344 ft-lbs. at 4,000 rpm; and 360 hp at 6,000 rpm with 352 ft-lbs. at 4,000 rpm. The engines of the following year had the same specifications.
For 1964, Chevy kept the same lineup of 327s, but increased the output of the two most powerful versions. They developed 365 hp at 6,200 rpm with 350 ft-lbs. at 4,000 rpm, and 375 hp at 6,200 rpm with 350 ft-lbs. at 4,600 rpm. The compression ratio on these two versions dropped to 11:1.
1965 to 1966
In 1965, Chevy added a fifth version of the 327 that had 350 hp at 5,800 rpm and 360 ft-lbs. of torque at 3,600 rpm. The compression ratio was 11:1. In 1966, the line consisted of only three models, all with carburetors. They developed 275 hp at 4,800 rpm with 355 ft-lbs. of torque at 2,800 rpm; 300 hp at 5,000 rpm and 360 ft-lbs. at 3,200 rpm; and 350 hp at 5,800 rpm and 360 ft-lbs. at 3,600 rpm.
1967 to 1968
The 1967 and 1968 model Chevrolets again had five 327 choices including one with a two-barrel carburetor for the first time. It developed 210 hp at 4,600 rpm with 320 ft-lbs. of torque at 2,400 rpm. The other models had 275 hp at 4,800 rpm with 355 ft-lbs. at 3,200 rpm; 300 hp at 5,000 rpm and 360 ft-lbs. at 3,400 rpm; 325 hp at 5,600 rpm and 355 ft-lbs. at 3,600 rpm; and 350 hp at 5,800 rpm and 360 ft-lbs. at 3,600 rpm. The compression ratios ranged from 8.75:1 to 11:1.
The final year for the 327 engine was 1969. There were only two versions available, both with two-barrel carburetors. They developed 210 hp at 4,600 rpm with 320 ft-lbs. of torque at 2,400 rpm, and 235 hp at 4,800 rpm with 325 ft-lbs. at 2,800 rpm. Both had compression ratios of 9:1.
Don Patton began writing after retiring from an engineering career in 2006. He holds a Bachelor of Science in electrical engineering from the University of California at Berkeley and continued with graduate study in software engineering.