1970 Chevy 250 CI Engine Specifications

Save

Chevrolet's 1970 250-cubic-inch in-line six-cylinder engine served as the base powerplant for Chevy and other General Motors' cars from 1966 until 1985 for the North America market and until 1998 for foreign markets. It often served as an alternative to Chevy's other base engine, the 230 straight-six. Most notably the 250 Six powered early Camaros, although few buyers purchased it.

Background

  • Chevrolet has a long history of producing sturdy in-line six-cylinder engines, but it hadn't always been that way. The automaker stubbornly clung to four-cylinder versions long after its competitors embraced the straight-six. However, in 1928, it developed the 215.5-cubic-inch "Stovebolt" Six, so named for head blots looking like stove bolts. It followed in 1936 with the 235.5-cubic-inch Blue Flame Six that provided standard power for Chevys until 1962. In 1966, Chevrolet developed the 250 straight-six that became the favored base engine for most Chevrolets through 1998.

1970 250 Specs

  • The 1970 version of the 250 Six featured the same horsepower and torque rating as the 250s dating to 1967. It featured a 3.875-inch bore and 3.53-inch stroke with a modest 8.5-to-1 compression ratio. Its firing order was 1-5-3-6-2-4. The engine generated 155 horsepower and 235 foot-pounds of torque. The 1970 model year was the 250's best as horsepower ratings steadily declined due to more strict federal emission standards. The 250's horsepower dropped to 145 in 1971, then to 139 in 1972, 100 in 1973, and then up slightly to 105 by 1975. Its compression ratio dipped as low as 7.7-to-1.

Features and Identification

  • The 1970 250 featured a single-barrel carburetor, although two-barrel versions were often used. The 250 received the two-barrel carb on Chevy trucks after 1978. The casting number on the 250 manufactured between 1968 and 1984 was 328575; the 250 also powered Buicks and Oldsmobiles. For 250s manufactured from 1968 to 1976 that powered Chevys, Buicks and Pontiacs, the casting number was 328576. The 250s powering only 1966 to 1976 Chevys had a casting number of 358825.

Vehicles

  • The Chevrolet 250 served as the base engine for the following vehicles: 1966 to 1984 Chevrolet passenger cars, the 1968 to 1976 Pontiac Firebird, the 1968 to 1970 Pontiac Tempest, the 1968 to 1976 Pontiac LeMans, the 1968 to 1972 Oldsmobile F-85, the 1968 to 1971 Buick Skylark and the 1968 to 1979 Camaro. It also powered the 1969 to 1979 Checker Marathon and the Brazilian 1968 to 1992 Chevy Opala.

Variants

  • Chevy offered three variants of the original 250. The L22 six-cylinder generated 105 horsepower and 190 foot-pounds of torque to power 1967 to 1979 Chevys. An LD4 straight-six was produced only in 1978. The LE3 saw production from 1979 to 1984. All three engines derived from the 1970 Chevy 250.

References

  • Photo Credit Photos.com/Photos.com/Getty Images
Promoted By Zergnet

Comments

You May Also Like

  • Information on Chevy 250 Inline Six

    The Chevrolet inline six-cylinder engine was General Motors' basic powerplant for entry-level Chevrolet cars and trucks. It's part of a long line...

  • Chevrolet 6 Cylinder Engine Information

    Detroit-based General Motors produced more than 30 6 cylinder engines over an 80-year period. Chevrolet was equipped with about 12 inline-6 and...

  • Torque Specifications for a Chevy 350

    The venerable Chevy 350 engine has been a mainstay of the industry, and is a favorite of hot-rodders and backyard mechanics. The...

  • 1966 Chevy Inline 6 Cyl Engine Specs

    Three in-line six-cylinder engines powered Chevrolet cars and trucks in 1966. Known as the third-generation sixes, the 194-, 230- and 250-cubic-inch engines...

  • How to Identify a Chevy 292

    The Chevy 292 is a six-cylinder engine most commonly found in Chevrolet trucks and was produced from 1963 to 1990. The engine...

  • How to Time a Chevy Inline 6

    The firing order for a Chevy inline 6 cylinder is 1-5-3-6-2-4, and the timing should be 4 degrees BTDC (before top dead...

  • How do I Decode GM Casting Numbers?

    General Motors engines aren't identical. They may appear identical as they sit in the engine bay, but they represent different designs and...

  • 1968 Chevrolet Truck Engine Specifications

    The year 1968 marked the 50th anniversary of Chevrolet's first manufactured trucks. The focus of most of the trucks released in 1968...

  • 327 Engine Specs

    Chevrolet produced the 327 engine for eight years during the 1960s. It was one of the many incarnations of the popular small...

  • 1970 Chevy Truck Specs

    The year 1970 was in the middle of an era which had a definite shift in trend for building and marketing pickup...

  • Chevy 292 Specs

    Chevy and General Motors used the Chevy 292 engine in their pickup trucks from 1963 to 1990, with production shifting from the...

Related Searches

Check It Out

How To Travel For Free With Reward Points

M
Is DIY in your DNA? Become part of our maker community.
Submit Your Work!