- 422
- Eastern MA
- Odin_Wednesday
Agreed. Classic American stuff is in CI and most modern stuff is in metric.
Not even all classic American stuff... nobody references the Ford Cologne V6 or Pinto/Lima I4 by their cid, as an example. Both are typically referenced by L of displacement.
Call it by how it's commonly known. For American V8s where the block design originates pre-1980 and for American I6s, use cid. For all others, use L.
So, e.g....
Ford Windsor small block would typically be identified as 260, 289, 302, or 351 cid.
Ford 335 "Cleveland" small block would typically be identified as 351 cid.
Ford Lima I4 would typically be identified as 2.3L.
Ford Cologne V6 would typically be identified as 2.8L, 2.9L, or 4.0L.
Ford Modular V8 would typically be identified as 4.6L or 5.0L.