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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsYes—Chevrolet built a 427-cubic-inch small-block. The LS7 in the 2007 Corvette Z06 was factory-rated at 505 hp at 5,500 rpm, according to GM Heritage. That is a documented production-engine rating, not a universal horsepower limit for every 427 small-block. The answer depends on which engine family and configuration you mean.
What does “427 small-block” mean?
“427” describes an engine’s displacement in cubic inches; “small-block” identifies its engine family or architecture. A 427-cubic-inch engine can therefore be a small-block or a big-block. The number alone does not tell you which one it is.
Chevrolet traces its Small Block V8 to 1954; it debuted for the 1955 model year at 265 cubic inches. The family name is an architecture distinction, not a promise that every Small Block has less displacement than every later Chevrolet V8. Chevrolet’s Small Block history provides the lineage.
How much horsepower can a 427 small-block make?
Factory example: the LS7
The clearest manufacturer-documented answer is the LS7 in the 2007 Corvette Z06: GM Heritage identifies it as a 427-cubic-inch small-block V8 and lists 505 hp at 5,500 rpm. This is the factory rating for that engine in that vehicle context—not a maximum for the entire 427 small-block category.
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GM Heritage also describes a 1970 Chevelle that was originally built with a 396 and later repowered with the LS7. That account documents the engine, but it does not show that Chevrolet sold the 1970 Chevelle from the factory with the 427 small-block.
Custom Gen I-based 427 builds
Aftermarket builders also use “427 small-block” for custom engines based on the classic Gen I small-block architecture. There is no single horsepower figure that can accurately describe every such build. Output depends on the specific parts, assembly, tuning and configuration; a meaningful number needs to be tied to an exact engine and, for a measured result, its test conditions. The LS7’s factory rating cannot simply be assigned to a Gen I-based build.
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Why other Chevrolet 427 ratings are not the answer
Chevrolet’s familiar historic 427 Corvette and its current ZZ427/480 crate engine are big-block examples, not small-blocks. Their ratings are useful for distinguishing the families, but they are not small-block horsepower figures.
| Engine | Architecture and context | Published rating |
|---|---|---|
| LS7, 2007 Corvette Z06 | 427-cubic-inch small-block; GM Heritage | 505 hp at 5,500 rpm |
| 1966 Corvette 427 | 427-cubic-inch V8; GM Heritage does not identify it as a small-block | 390 hp or 425 hp |
| Chevrolet Performance ZZ427/480 | 427-cubic-inch big-block crate engine | 480 hp at 6,000 rpm; 490 lb-ft at 3,800 rpm |
The 1966 ratings are from GM Heritage’s 1966 Corvette page. Chevrolet Performance identifies the ZZ427/480 as a big-block and lists its ratings on the ZZ427/480 product page. The ZZ427’s name is not evidence that it is a small-block.
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How to compare 427 engines without mixing them up
Before comparing horsepower claims or choosing an engine, establish what the number refers to:
- Architecture: Is it a classic Gen I-based small-block, an LS7, or a big-block?
- Rating type: Is the figure a manufacturer’s factory rating or a result measured from a modified build?
- Configuration: What displacement, components, tuning and naturally aspirated or power-adder setup does the figure describe?
- Use and package: Does the complete engine package suit the vehicle and intended use, and are fitment and supporting parts accounted for?
The official ratings above identify specific engines; they are not a controlled comparison across generations or configurations. For a custom engine, ask for the build details and the test basis behind its claimed output rather than relying on a generic “427” label.
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Buying or installing a crate engine
Chevrolet Performance describes crate engines as fully assembled engines sold as standalone packages for project vehicles, hot rods and custom builds. Its lineup includes traditional Small Block and Big Block engines as well as LS and LT options. Check the exact product’s installation requirements, vehicle fit and included components before choosing it. Chevrolet Performance also warns that some emissions-related parts may not meet public-road regulations and may be intended exclusively for competition use; verify the product’s applicable local legality.
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