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The Pontiac straight-8 engine is an inline eight-cylinder automobile engine produced by Pontiac from 1933 to 1954. Introduced in the fall of 1932 for the 1933 models, it was Pontiac's most powerful engine at the time and the least expensive eight-cylinder engine built by an American automotive manufacturer.
Pontiac’s Straight 8s. The Pontiac L-head straight eight was used in production cars for 21 years between 1933 and 1954. This classic engine was advertised as a powerplant that could run 100,000 miles without a major overhaul. By John Gunnell.
Under the Hood: Pontiac’s 1933-’54 straight-8 was smooth, quiet, and pleasant to drive. For 1933, brilliant Pontiac engineer Ben Anibal penned a 223.4-cu.in. engine that produced 77 horsepower (12 more than Ford’s V-8 at that time).
In addition to BigKev's engine serial number reference for all Packards, member John Lawrence (JW) has provided us with a concise table of basic specifications and applications for straight eight engines from 1935 to 1954:
The new eight featured low-compression (usually between 7.00:1 and 8.00:1 ratios), long-stroke (usually between 4 1/4-inches and 4 5/8-inches), and 125–160 hp. These were silky smooth and easily propelled the mammoth 5000-pound cars from a dead stop in high gear—which was rumored to have been advised by dealers.
In its ultimate 1954 tune with 268.4 cubic inches and 7.7:1 compression ratio, the straight eight was good for 127 hp at 3800 rpm and 224 lb-ft of torque at 2200 rpm. (That works out to 126 psi BMEP, slightly better than the 1953 Ford flathead V8.)
The Pontiac L-head straight eight was used in production cars for 21 years between 1933 and 1954. This classic engine was advertised as a powerplant that could run 100,000 miles without a major overhaul.
Specifications. Compression on the "eight" was at 6.5 - 1 ratio up to 1952, then 6.8-1, and 7.7-1 ratio to '54, with an engine idle speed of a remarkably low 450 rpm with standard transmission and 375 rpm (while in drive) for the automatic. A modern engine is usually tuned to a minimum 600-700 rpm.
The Pontiac straight-8 engine is an inline eight-cylinder automobile engine produced by Pontiac from 1933 to 1954. Introduced in the fall of 1932 for the 1933 models, it was Pontiac's most powerful engine at the time and the least expensive eight-cylinder engine built by an American automotive manuf.
The Chieftain (aka the Pontiac Eight with the Silver Streak inline-8) used GM’s A-body platform through 1954. That engine has a displacement of 268 cubic inches and held court until a new V8 arrived in 1955.