How we source our data

Specs come from GM/manufacturer documents where available, otherwise from reputable published references; secondary data is labeled.
Prices are from vendor catalogs on the date shown and change often. Always check the current price.
Fitment is taken from vendors' product listings and install guides. "Kit-verified" means we found a vendor kit for that vehicle.
Owner results (cam dyno numbers) are aggregated from public forum threads. They are exploratory: different dynos, heads, tunes and mods. We show medians and ranges.
Answers are written from those sources, and conflicting sources are noted instead of hidden.

What our numbers mean

Engines: distinct GM small-block engine codes (RPOs) in our engine table, Gen III through current, plus a few crate engines.
Cams: distinct cam grinds for GM V8 LS and LT engines, listed by a maker or authorized reseller. Each grind counts once: a cam sold alone and inside kits is one cam, and a second listing of the same grind (a blemished "garage sale" copy, for example) is not counted again. Different lift, LSA or valve-spring versions of a grind are separate cams. Cam kits and custom-grind services are labeled as such and not counted, and V6 cams are left out. Where the maker publishes only part of a spec (212/22X), we show the X and keep it out of number filters. A few cams are listed before we've confirmed their specs; their pages say so.
Owner dyno results: builds posted on public forums that include a dyno number. They are owner reports, not our measurements: dynos, fuel, tune and supporting parts vary, so we show medians and ranges. Naturally aspirated and boosted results are kept separate.
Parts: vendor catalog listings we've classified as LS-swap relevant, with the price as of the date we last checked it. Prices change; always check the vendor.
Fitment: "Listed options" on a vehicle page means the vendor's own listing names that vehicle. That's a title match, not a fitment guarantee — vehicle-specific kits in our parts lists are the stronger evidence. Confirm with the vendor before buying.
Tune library: as of October 15, 2026, 4,110 of the 4,448 tune files we have read are from GM LS-family computers (P01, P59, 1997–98 PCM, E38, E40, E67 and E92) and are marked usable (or stock) in our curation; the rest are other computers or files we excluded. We count files, not vehicles: one car can have several revisions. A Tune Report compares your file only with the closest matching subset (same computer family, and engine, cam, fuel, induction and transmission where we have them), so the group behind any one comparison is much smaller, and the report says when the match is broad. Raw files, VINs and owner details never appear on the site.