The Subaru FA & FB engines (eg. FA20 in the Toyota 86) have a fatal flaw. When a valve spring loses pressure, the rocker arm assembly can fall out. If it's picked up by the camshaft, it gets shot out the tappet cover, causing oil to spill onto the exhaust headers, potentially catching fire. 

Now, without the rocker, the valve can drop inside the cylinder and destroy the piston. Yes, sometimes it’s an over rev but it can happen across the rev range even on your daily driver.

So if you drive a Toyota 86, or any Subaru with an FA or FB engine, this IS the most important upgrade you can do to save you an expensive engine rebuild. It’ll give you peace of mind when driving.

WHAT'S INCLUDED

• 16x Denstoj Pivots (Heat treated billet alloy steel)
• 16x Denstoj Rocker Retainer Clips (Heat treated high carbon steel)

VEHICLE FITMENT

Our kit works on all Subaru FA and FB Engines (FA20D, FA20F, FA24F, FB16, FB20, FB20A, FB20D, FB20X, FB25, FB25B) which are in the below vehicles.

Note: The Subaru FA20 in the Toyota 86 is also known as the 4U-GSE.

PART NUMBERS

Our pivot replaces:

Our rocker retainers worth with the following rocker arms:

FITTING INSTRUCTIONS

Valve Clearance/Lash Specifications for the FA20 Engine:

• Inlet: 0.10 - 0.16 mm (cold)
• Exhaust: 0.21 - 0.27 mm (cold)

These specifications fall on the looser side of the tolerances recommended by various sources, allowing for safe operation and optimal performance under higher load or racing conditions. For those seeking a tighter clearance, another common set of specifications is:

• Inlet: 0.10 - 0.15 mm (cold)
• Exhaust: 0.20 - 0.24 mm (cold)

Recommended Clearances
Our go-to settings for most applications are 6 thou (0.1524 mm) for the inlet and 10 thou (0.254 mm) for the exhaust. This balance ensures reliable operation, especially when pushing your engine at high RPMs or under heavy load.

We have a worksheet to help you set up the valves correctly, which you can find here: Denstoj Subaru FA20 Valve Adjustment Worksheet

For full instructions on fitting our Rocker Retainer Kit on FA and FB Subaru engines, see our detailed guide here: 

Important Notes
The Subaru FA & FB engines use solid (not hydraulic) pivots, meaning lash adjustment is done manually via shims. These shims are available separately from your local Toyota dealership according to the standard valvetrain setup procedure.

Please install at your own risk
It’s critical that the clips are installed correctly to avoid placing unnecessary load on them, except in preventive situations where the rockers are unloaded. While our Rocker Retainer Kits are OEM drop-in compatible, always ensure clearances are set properly for your specific engine during any valvetrain work.