Match the source to the question
Factory manuals, ordering information, and dated revisions help establish what was offered for a particular year and configuration. Contemporary road tests describe the car tested. Specialist registries and marque research can explain production records, codes, and exceptions.
Check the source's date, model, engine, and body style before applying a statement to another car. A sales listing can document a particular sale or a seller's description; it needs corroboration before supporting a factory specification.
Keep the measurement context
Read horsepower alongside its rating basis and source. Factory ratings, engine tests, and measurements at the wheels answer different questions. For acceleration, look for the tested transmission, gearing, tires, and any modifications before comparing results.
Explore period quarter-mile tests with source scans, gearing, tires and preparation notes.
See gross versus net horsepower for a factory example with paired ratings and the limits of percentage conversions.
Price records also need context: original purchase prices, dated auction sales, unsold high bids, asking prices, and guide estimates should retain their own labels. Follow the evidence date and condition notes when interpreting a value.
A reported total has a specific scope
For example, ChevelleStuff's 1970 option table reports 4,475 for the LS6 engine option. That row does not give a separate count for each body style. The option total alone cannot establish how many LS6 convertibles were built.
The 1970 Chevelle LS6 profile identifies that figure as reported. Keep that qualification when citing it. A registry sample, an estimate, and a complete factory total carry different limits; an unknown breakdown should stay unknown.
Read uncertainty and photos together
When references disagree, compare what each actually covers and follow the page's source notes. An unresolved detail may need a dated revision, a clearer document, or evidence from the individual car. Repetition across websites does not make a claim independently verified.
Photos need a credit and reviewed usage status. A representative image can show appearance while leaving the photographed car's original engine, options, or ownership history unproven. Read its caption and identity notes before using it as evidence of authenticity.
Understand the editorial attribution
See About Classic Muscle for the site's purpose, attribution and correction guidance.
Classic Muscle is built by Data Relativity. Research, extraction, and drafting in this archive use automated tools, including AI. The Classic Muscle Editorial label identifies the archive's editorial presentation; it does not name an independent specialist who inspected the car.
A last-reviewed date is the review date recorded for that page. It is not the date of every source, photograph, or market observation. Use the citations and review and correction history to understand what evidence supports the current record.
Help improve a specific claim
Start at Contribute to see available requests for photos, factory records, and other evidence. When a submission route is available, include the car page, the detail at issue, and a source that supports the correction. A document title, date, and page or table reference make the claim easier to check.
For photos, include the creator, permission or license, and what is known about the car pictured. Read the submission privacy information before providing records containing personal information. Contributions need review before they change a public page.