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The 425-cid Olds big-block V8 was the company's first tall-deck big block. It was produced from 1965-'67. The standard 425 of 1965-1967 was called the Super Rocket. It was the most powerful Olds 88/98 engine and compression ratios up to 9.0:1 were available. A special Starfire 425 engine had a modestly different camshaft grind.
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The big-block and diesel engine blocks also used a 3.000-inch main bearing diameter over the small-block's main bearing dimension of 2.500-inch. Pricing on the WPE Z head starts at $2,850 per pair for the Stage 1 design, with incremental prices increases as the user seeks to increase performance by choosing the Stage 2, 3 or 4 designs.
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Rocket Racing also makes all the different components needed to build your big-block Oldsmobile into a big-cube powerhouse. With their 4.250 or 4.500-inch billet cranks and 4.40-inch pistons on the shelf, you can easily get between 517- 548 cubic inches out of their block. If you want to order custom parts, 600-plus cubic inches is.
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From its original displacement, the Olds small-block went on to be produced in 260-, 307-, 350-, and 403-inch versions, while the original tall-deck Olds big-block line was augmented with the.
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Big Pump vs. Little Pump. Engines in their simplest form are air pumps. The bigger the displacement of the pump, the greater the potential power; when all things are equal, the bigger the engine.
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Eagle offers a reasonably affordable big-block Olds "cast-steel" 4.5-inch stroker crank that comes machined with big-block Olds 3.0-inch main journals and 2.20-inch big-block Chevy rod journals.
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The engine uses the 5.7 diesel block, bored .153-inch oversize to arrive at a final bore dimension of 4.210-inch. Hood has also equipped the block with old NASCAR splayed 4-bolt main caps for extra strength. A production steel Oldsmobile 425 big-block crankshaft has had the outer diameter cut down .375-inch to fit into the block.
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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. Oldsmobile discontinued the 403 after the 1979 model year. General Motors used the Olds 403 as a 'corporate engine' across its line of brands.
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The 425 cu in (7.0 L) big-block was the first tall-deck "big block," produced from 1965 through 1967. It is arguably the best engine Olds made in the muscle car era, although it never made it into a "muscle car". It used a 4.126 in (104.8 mm) bore and 3.975 in (101.0 mm) stroke.
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Big-Blocks. Oldsmobile big-block engines also consisted of three different cubic-inch displacements. They were offered at 400, 425, and 455 ci. With regard to high-performance use, the 455 is the most popular and is used most by Olds enthusiasts. Oldsmobile big-blocks have many shared features and dimensions.
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The 403 was made from 1977 to 1979 and used across the Buick, Olds, Pontiac and Cadillac vehicle lines. It was also used in other applications like motor homes, boats and some industrial applications. It was sort of meant to replace the previous use of big block engines in the BOP line. Stock specs on a 1977-79 403 are: 185hp@3600 RPM, 320ft.
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Olds big block engines were cast with extremely high nickel content until mid 1970. You can easily spot the difference in the shape of the "F" near the oil sending unit. Look at any 1968 1969 and early 1970 block and the F will be different in shape than any late 1970 to 1974 block. In 1975 the nickel content was lowered even more.
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Overshadowed by the likes of Chevrolet and Pontiac, Oldsmobile delivered one of the mightiest, and most versatile big block engines of the period: the 455 V8. What helped set the Oldsmobile 455โalso known as the 'Rocket'โapart from the other large displacement eight-cylinder engines offered by General Motors was in the wide range of vehicles where it was available as an option.
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Oldsmobile 455 V8 Big Block. In 1968 Oldsmobile debuted the Rocket 455, an engine that was part of a family of 3 (with 400 and 425 cubic inch engines sharing a similar architecture). Offering between 310 and 400hp, and pushing out a spectacular 500 lb-ft of torque, the 455 big block was most famously used in the 442 muscle car.
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9 Photos. As originally built, an Olds 455 had a 4.126-inch bore combined with a 4.25-inch stroke. This one has had its bores massaged out to 4.185-inches, so in theory it's a 468, but 455 just.