torque 244 lb ft @ 1300 rpm. 302 The GMC inline six was produced from 1952 to 1960, when it was replaced by the V6. It has a square bore/stroke ratio of . This is the largest raised-deck engine. It was originally designed for the GMC military M135 and M211. It was used in military 2-ton trucks with the Hydramatic transmission; however, the engine was a sealed engine for snorkel/submersion use, had an electric fuel pump, and other features such as a deep sump oil pan. From 1952 to 1959, GMC manufactured the civilian 302 engine, which was not sealed, had a mechanical fuel pump, and used a standard oil pan. Power listed in 1959-160 HP @ 3600 rpm; torque 268 lb ft @ 1600 rpm. This engine was popular with hotrod enthusiasts because it delivered tremendous power for an inline six engine at the time (although now obsolete), is built with a heavy cast block, and can take quite a bit of abuse. Group 2 278 The 278 was released in 1939 alongside the 308, sharing the same stroke but with a bore. It produced a maximum 110 hp @ 3000 rpm and 230 lb•ft @ 1000 rpm. The 278 was discontinued in 1946. 308 The 308 was released in 1939 alongside the 278, sharing the same stroke but with a bore. It produced a maximum 122 hp @ 3200 rpm and 241 lb•ft @ 1000 rpm. The 308 was discontinued in 1949 and replaced by the 318. 318 The 318 was released in 1950, replacing the 308. It shared the same stroke as its predecessors but with a slightly larger bore. It produced a maximum 136 hp @ 3400 rpm and 245 lb•ft @ 1400 rpm. The 308 was discontinued in 1954 and replaced by the 324 cubic inch Oldsmobile V8. 360 The 360 was released in 1950, replacing the physically larger 361 "Group 3" engine. The 360 and 361 shared the exact same bore and stroke, but the 360 used the mid-size "Group 2" block. It produced a maximum 127 hp @ 3000 rpm and 289 lb•ft @ 1300 rpm. The 360 was discontinued in 1955 and replaced by the 324 cubic inch Oldsmobile V8. Group 3 361 The 361 was released in 1939 alongside the 426 and 451. The 361 was discontinued in 1949 and replaced by the 360 "Group 2" engine. The 360 and 361