GMC Straight-6 engine
Encyclopedia : G : GM : GMC : GMC Straight-6 engine
GMC as a marque really only "owned" two engine designs, this straight-6 and a V8. The division "borrowed" many engines from other GM divisions, as noted below.
Non-GMC engines
207
In 1935 and 1936, GMC used Chevrolet's 207.
230
From 1937 through 1950, GMC used Oldsmobile's 230.
223
In 1938, GMC used Pontiac's 223.
235
GMC used the 235 in³ (3.9 L) Chevrolet Straight-6 engine as their base truck powerplant in the 1950s.
261
The Chevrolet 235 was bored out to 3.75 in (95.2 mm) to displace 261 in³ (4.3 L). This engine was offered as a step up from the 235 starting in 1954. It was replaced by the GMC V6 engine in 1960.
292
From 1963 through 1978, GMC had its own distinctive version of Chevrolet's straight-6, the 292.
GMC engines
228
GMC replaced the Pontiac 223 with their own 228 in³ (3.7 L) 228 in 1939. This side-valve engine was produced through 1953.
236
GMC also developed an OHV/pushrod engine in 1939. The 236 in³ (3.9 L) 236 was the first, lasting through 1955.
248
Those same years (1939-1955), GMC produced a 248 in³ (4.1 L) engine, the 248, which was similar to the 236.
256
The 256 in³ (4.2 L) 256 was different from the 236 and 248. It was also an OHV/pushrod engine, and was built for just two years, 1940 and 1941.
270
The last GMC-only straight-6 was the 270 in³ (4.4 L) 270. It was produced from 1941 through 1962 and was an OHV/pushrod engine.
302
The "other" last GMC-only straight-6 was the 302 in³ (4.4 L) 270. It was produced from the early 50s through 1962? was an OHV/pushrod engine. It was originally designed for the GMC military 2 1/2 ton trucks (M135 and M211).
See also
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