Is the Oldsmobile 403 a big block or small block?

The Olds 403 was designed to be a big block in a small-block package. As a result, it has a bore of 4.351 inches (110.5 mm), giving it one of the widest bores of any factory small-block V8.

How much horsepower does a Olds 403 have?

The Olds 403 was used by Buick and Pontiac in addition to Oldsmobile until its discontinuation after 1979. Output was 185 hp (138 kW) and 320 lb⋅ft (430 N⋅m).

Where is the engine code on a block?

The engine ID code stamping is located on a flat pad in front of the passenger side cylinder head (big blocks can be in the same location or above the timing chain cover, with inline-sixes stamped on the passenger side of the block behind the distributor).

How do you read a motor serial number?

Engine Serial Number composition

1. the list number or build list, typically 2 to 4 letters followed by 4 or 5 numbers.
2. a letter identifying the country.
3. a series of numbers showing the build line, also called a serial number.
4. a letter indicating the year of manufacture.

What is the most powerful V8 engine?

ZZ632/1000 V8 is rated at 1004 horsepower The Chevrolet Performance division has revealed the biggest and most-powerful naturally aspirated V8 engine it has ever built, even as General Motors accelerates its transition toward electric power.

When did Oldsmobile stop making the 403?

Oldsmobile discontinued the 403 after the 1979 model year. General Motors used the Olds 403 as a ‘corporate engine’ across its line of brands. Oldsmobile, Pontiac, Buick, and GMC offered the Olds 403 in passenger cars and RVs. Is the Olds 403 a Good Motor? Engine builders know that it’s often easier to generate high RPM power with a short stroke.

Do Oldsmobile 403 engines have solid main webs?

Some Olds 403 engines may have come with solid main webs. Forum rumors and some Oldsmobile experts believe that General Motors briefly produced the solid main 403 in 1976 or 1979 for a few select vehicles, including the Pontiac Bonneville and the Pontiac Trans Am (with tow package).

Did General Motors ever make a solid main 403?

Forum rumors and some Oldsmobile experts believe that General Motors briefly produced the solid main 403 in 1976 or 1979 for a few select vehicles, including the Pontiac Bonneville and the Pontiac Trans Am (with tow package). Chris Witt (an Oldsmobile Forums legend) supposedly offered a $1 million bounty for the elusive engine.

What are the problems with the Olds 403?

Thanks to the emissions components, the stock 403 had a low compression ratio, bad cylinder heads, and poor fuel economy. From the factory, the Olds 403 was a typical 1970s smog-era motor. Another Olds 403 problem is its windowed main webs.