First-Generation FR-S, BRZ and 86 FA20 Complete Engine, Partial Engine and Long-Block Donor Identification

The only retained explicit replacement relationship is Scion/Toyota 6FC partial engine SU003-05254 -> SU003-10505. All other listed complete-engine, partial-engine, short-block and harness identities are parallel year, transmission, grade or badge catalog branches unless a VIN-specific catalog proves otherwise. No Subaru-to-Scion/Toyota supersession is asserted, and complete-engine, partial-engine, short-block and seller-described long-block terms are not interchangeable content guarantees.

Start with the recipient VIN, build date, badge, transmission, emissions label, installed engine/assembly marking and current calibration; require the donor VIN, build, transmission and readable identity before purchase. Toyota documents D-4S direct plus port injection throughout this first-generation scope. Subaru documents a materially revised 2017 manual-transmission engine with changed valves, camshafts, cylinder block, aluminum intake manifold and high-flow exhaust, while the 2017 automatic retained the prior 200-hp engine specification; the checked later Subaru catalogs accordingly separate manual and automatic complete-engine and short-block identities. Do not extend a seller's 2013-2020 or manual-to-automatic claim across those boundaries. Itemize the block, both heads and covers, timing/front cover, oil pump, oil pan and pickup, intake and exhaust manifolds, throttle body, direct and port injectors and rails, high-pressure pump, coils, sensors, harness, ECM/injector driver, alternator, starter, A/C compressor, water pump, brackets and mounts, flywheel/flexplate, clutch or torque-converter interfaces, cooling connections and certified emissions hardware. Preserve the recipient's compliant catalysts, oxygen/air-fuel sensors, evaporative equipment and calibration unless an authorized current procedure says otherwise. Before buying used, require donor VIN and mileage basis, cold and warm compression or leak-down results for all four cylinders with test method, hot oil pressure if available, startup/run video, oil consumption, smoke, blow-by, knock or timing noise, overheating and recall/repair history, oil/coolant contamination, drain and mount thread condition, storage history, warranty/startup deadline, core terms and freight-damage procedure. Diagnose fuel, ignition, wiring, control, cooling, catalyst and oil-pressure faults before condemning the long block. Use qualified heavy-component lifting/support and the current badge/VIN-specific removal, installation, priming, cooling and initialization procedures.

A documented remanufactured long block or a machine-shop rebuild of the known original can be preferable to an unknown donor, but require the exact naturally aspirated FA20D/4U-GSE year/transmission architecture, recipient and core VIN applications, block/head/crank measurements, machining and cleaning report, bearing and piston sizes, oil-pump and timing work, gasket/seal brands, exact included externals, startup/installer requirements, warranty, core and freight terms. Used and imported engines remain sourcing leads only. Turbo FA20DIT, FA24, hybrid, stroker, closed-deck, forced-induction and motorsport builds are outside this factory-replacement guide and must not be presented as plug-and-play emissions-compliant replacements.

US first-generation naturally aspirated FA20D/4U-GSE cars only. Match recipient and donor VIN/build, badge, 6MT/6AT, emissions label, exact assembly identity and calibration. The 2017-2020 manual engine is a revised branch; the automatic retained the earlier 200-hp specification. Complete, partial, short-block and long-block labels do not guarantee the same contents, and harness, ECM, injection, accessories, transmission interfaces and emissions equipment require an explicit inventory. Seller cross-year/cross-badge fitment and mileage claims are not catalog proof. Require donor tests, warranty/core/freight terms and qualified installation.

Supersede reviewed 20 unique research sources for this guide. 6 also appear above as a seller or official action and are not repeated here; 14 additional citations follow.

Research last verified 2026-07-28.

1. Pressroom toyota — 2013 scion fr s brings sport back to carOpen source
2. Pressroom toyota — 2017 toyota 86 is affordable fundamental sports carOpen source
3. Subarumedia iconicweb — 2017 Subaru BRZ Release Final10.24.2016Open source
4. Subaru Parts Deal — engine assemblyOpen source
5. Subaru Parts Deal — engine assemblyOpen source
6. Subaru Parts Deal — engine assemblyOpen source
7. Subaru Parts Deal — engine assemblyOpen source
8. Subaru Parts Deal — engine assemblyOpen source
9. Toyotapartsdeal — partial engine assemblyOpen source
10. Toyotapartsdeal — partial engine assemblyOpen source
11. Toyotapartsdeal — short block assemblyOpen source
12. Toyotapartsdeal — short block assemblyOpen source
13. Subaru Parts Deal — engine wiring harnessOpen source
14. Toyotapartsdeal — wiring clampOpen source