The 4AGE blacktop is the last and most developed version of Toyota’s 1.6L 4A-GE twin-cam, a 20-valve engine with individual throttle bodies built for the mid-1990s AE111 Corolla generation. Before it came the 20-valve silvertop, and before that the 16-valve bigport and smallport engines that made the AE86 and first MR2 famous. If you want the most power and rev-happy character from a stock 4A-GE, the blacktop is the one to buy. If you want an engine that is correct for an AE86 or MR2 restoration, a 16-valve is the right choice.
The nicknames get thrown around loosely, so here is what each generation actually is and how to tell them apart.
The 4A-GE family in one paragraph
The 4A-GE is a 1.6L inline four-cylinder with double overhead cams, developed by Toyota with a cylinder head designed in partnership with Yamaha. It ran for well over a decade in several generations. The early engines have 16 valves, four per cylinder. The later engines have 20 valves, five per cylinder, with three intake valves and two exhaust valves. The cam cover color nicknames come from the paint on those covers, but the casting, port shape and engine code tell you more than the paint ever will.
Bigport: the original 16-valve
The first-generation 4A-GE is the bigport. It is the engine in the early AE86 Corolla Levin and Sprinter Trueno (sold in the US as the Corolla GT-S) and the first MR2. It gets its name from large intake ports, and many versions use T-VIS, a system of butterflies in the intake runners that improved low-speed airflow.
Bigports are prized by AE86 purists because they are period-correct. They are also the oldest engines in the family, so condition varies a lot, and many need a full refresh before they run like new.
Smallport: the refined 16-valve
Toyota revised the 16-valve engine in the late 1980s. The intake ports shrank, which improved air speed and midrange response, and T-VIS was dropped. Smallports show up in later AE86 and MR2 production and in the front-drive AE92 Corolla generation. Toyota also continued updating the bottom end during the 16-valve years, so two smallports from different years may not share every part.
For a 16-valve build, many tuners prefer the smallport for its stronger midrange and updates. Restorers still often want a bigport for an early car.
Silvertop: the first 20-valve
The silvertop arrived in the early 1990s with the AE101 Corolla and Levin/Trueno generation. It brought the five-valve head, individual throttle bodies for each cylinder and variable valve timing on the intake cam. It is a big step up in character from the 16-valve engines, with a sharper throttle response and a more eager top end.
Silvertops are popular for swaps because they offer most of the 20-valve experience at a lower price than a blacktop.
4AGE blacktop: the final version
The blacktop came with the AE111 generation in the mid-1990s. Toyota revised the engine further, with changes that included higher compression, lighter internals and revised intake hardware, all aimed at more power and a freer-revving engine. It is the most powerful naturally aspirated factory 4A-GE, and that is why the blacktop commands the highest prices.
Published output figures differ between sources and markets. If you need an exact number for a specific engine, confirm it with Toyota reference data or the seller before you plan around it. You can see an example in our JDM 4AGE blacktop engine listing, and check whether it includes the ECU, harness and throttle bodies.
Generation comparison
| Generation | Valves | Era and common cars | Key features | Who buys it |
|---|---|---|---|---|
| Bigport | 16 | Early AE86, first MR2 | Large intake ports, T-VIS on many versions | AE86 and MR2 restorers |
| Smallport | 16 | Later AE86 and MR2, AE92 Corolla | Smaller ports, no T-VIS, updated bottom end | 16-valve builders |
| Silvertop | 20 | AE101 era | Five valves per cylinder, individual throttle bodies, intake cam timing | Value 20-valve swaps |
| Blacktop | 20 | AE111 era | Further revised internals and intake, highest stock output | Performance swaps, collectors |
Swapping a 20-valve into an AE86
The silvertop and blacktop came from front-drive cars, so they sit sideways in their original engine bays. Putting one into a rear-drive AE86 is a well-known swap, but it means sorting out a rear-drive oil pan and pickup, the bellhousing and transmission, engine mounts, exhaust, cooling and wiring. The ECU and harness also need to match the engine, or you will need standalone engine management.
Price all of that before you buy. A cheaper silvertop with a sorted plan can finish ahead of a blacktop that arrives without the parts you need.
What to check before you buy a 4A-GE
- Confirm the engine code and generation from the block and head, not just the cam cover color. Covers get swapped and repainted.
- Ask what is included: ECU, harness, throttle bodies, distributor, intake, exhaust manifold and transmission.
- Look for compression or leak-down results and signs of overheating.
- Plan to replace the timing belt and water pump before running it hard.
- Check that oil pan, sensors and brackets suit your chassis layout.
Our used engine buying checklist covers the right questions in more detail, and our guide to identifying an engine code helps you match what you have to what you are buying.
Alternatives worth a look
If your goal is more power from a Toyota four-cylinder rather than a period-correct twin-cam, some builders look at turbocharged engines like the JDM Toyota 3S-GTE. It is a larger, heavier engine and a very different swap, so it suits a different kind of build.
Shopping for a 4A-GE
Browse our Toyota replacement engines for 4A-GE and other JDM Toyota options, see the wider replacement engines category, or visit our Toyota brand page. For company and model history, see Toyota.
Frequently asked questions
What is the difference between a 4AGE silvertop and blacktop?
Both are 20-valve engines with individual throttle bodies. The blacktop is the later version with further revised internals and intake hardware, and it makes more power in stock form.
Is a bigport or smallport better?
The smallport usually has better midrange and later updates. The bigport is preferred for early AE86 and MR2 restorations because it is period-correct.
Can a 4AGE blacktop go in an AE86?
Yes, it is a popular swap, but it needs rear-drive oil pan and pickup parts, mounts, a matching transmission setup, and an ECU and harness that match the engine.
How do I tell which 4A-GE I have?
Check the engine code and casting details on the block and head, count the valves per cylinder, and look for individual throttle bodies. Do not rely on cam cover color alone.
Start with the right reference 
Plan the arrival Always confirm the exact model, part number, condition and included components on the product listing. For a compatibility question, contact TorqueHarbor before ordering.