Every part for a built FA20, in the order you'll fit it.
Start at the block, then studs and the rotating assembly, and work out from there. Every part here is listed for the FA20 and sold on epoxy54.com.
Customer Subaru install
Block reinforcement
The FA20 is an open-deck boxer. EPOXY54 fills the top 3/4" of the water jacket for closed-deck strength without machining, and coolant still flows underneath. Do it first. It's block insurance for everything after.
- EPOXY54 block epoxy kitPick Flat 4 and Partial Fill. 21,000 psi compressive strength, 1:1 thermal expansion with aluminum.
- EPOXY54 Install Kit5/32" drill bit, install bottle and stir stick.
How it's done: FA20 closed deck conversion · Installation guide · Fill volume guide
Head studs
ARP studs clamp both heads harder than the factory bolts.
Pistons and rods
86 mm is the stock FA20 bore. Lower-compression forged pistons and stronger rods are the base of a boosted build.
Bearings
Fresh rod and main bearings are cheap next to the engine they protect.
Head gaskets and valvetrain
MLX gaskets seal under boost; you need one per side. Stiffer springs keep the valves controlled at high rpm.
Fuel
On the BRZ / FR-S / 86, bigger port injectors and an in-tank pump support boost and E85.
Boost and cooling
More boost means more heat. Pick parts for your chassis: BRZ / 86 or the turbo WRX.
Clutch
The factory clutch is next to go once torque goes up.
See it in real builds
Subaru builds running EPOXY54 are on our customer builds page. Questions about your combo? Call (604) 809-7398 or email support@epoxy54.com.
Shop all Subaru FA20 parts