Beginning in the 1988 model year, in the North American market, the A20A3 and A20A4 used a dual-stage runner intake manifold design, 4-2-1 exhaust manifold, and a more advanced electronic distributor.

The aftermarket has produced various parts for the Accord and Prelude A series engine.

Most upgrades and modifications to the A-series engines are of the do-it-yourself variety, with one of the more popular being a turbo setup and OBD-1 conversion for more tuneability options.

The A16A1 was a carbureted 1.6-liter engine used in 1986–1989 Accords and Vigors outside the North American market.

They are the same engine, the only difference between them being that the A20A2 has no emissions components, so it has a slightly higher power output.