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RX-7 LS swap
The big decision in an RX-7 LS swap is where the engine sits: FD and FC mounts are different parts.
Last updated
Mazda · 1979–2002Swap kits verifiedFB / FC / FD1 parts list
LS Gen III/IV swap — moderate
Mazda RX-7 FD3S LS3 swap: Sikky Stage 3 package (includes wiring harness); T56/T56 Magnum; also offered for LS1.
Parts and steps for the RX-7
Every part option we know for each stage of the swap. Open a step, start with our pick, and check all the options. Plan your exact combination →
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Before you buy
Parts we know for this vehicle: 34 options across 10 of 10 categories. Thinnest: oil pan.
What it costs: budget build about $12,000; typical build $25,000 (parts, not labor, prices as of 2026-10-01).
Sikky Stage 3 + Wiring Specialties harness package $4,169; documented LS1 FD builds typically $15k-$25k all-in
Required parts priced so far: $4,384.91 (required parts on this parts list that have a listed price; parts only: engine, transmission, wiring and labor are extra. Build the full budget →)
Tags: Verified on our parts list or confirmed on the maker's page for this vehicle · Listed the vendor's catalog names this vehicle · Community from owners' builds and small sellers.
Beta We're still fixing fitment as owners report it. Double-check parts before you buy. See what's new →
Our sourced parts list is for the FD (1993–2002) RX-7. FB (1979–1985) and FC (1986–1992) use different parts; parts made for one generation say so.
2Mounts, crossmember & oil panSet where the engine sits, then pick a pan that clears · 3 parts
Mounts & swap kits
4 options · $474.99–$4,384.91Why you need it: The mounts set where the engine sits, and that decides oil pan, header and driveline fit. FD and FC mounts are different parts. Sikky's FD mounts fit left- and right-hand drive; its headers and pan are drawn for them. More: engine mounts and swap kits.
Our pick and alternativespick + 2 of 4
Compare 4 mount & swap kit options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Sikky Stage 3 RX-7 FD3S LS3 package w/ wiring harness Verified Our pick · for FD only | Stage 3 FD LS3 | $4,384.91 2026-09-28 | for FD only | Direct from Sikky | |
| Sikky Manufacturing (direct) Standalone RX7 LS Swap Motor Mounts (direct) Listed | — | FD RX-7 w/ LS Mounts only. Bushings are sold separately as an add-on. for FD only | Check price & fitment | ||
| Sikky Manufacturing (via FR Sport) Sikky FD RX-7 LHD LSx Engine Mounts Listed | MK005 | 474.99 2026-10-01 | FD RX-7 w/ LS1/LS2/LS3/LS6/L99/LQ4/LQ9/LSA/LS7/LS9/LSX Works on left-hand drive and right-hand drive vehicles. for FD only | Buy | |
| eBay seller (South El Monte, CA) Engine + Transmission Mounts Swap Kit For Mazda RX-7 FC with LS1 Engine Swap Listed | — | 761.92 2026-10-01 | Mazda RX-7 FC (1986-1992) w/ LS1 Doesn't fit: This kit is FC-specific; FD (1993-2002) needs FD mounts. for FC only | Check price & fitment |
Oil pan
1 option so far · $643.98Why you need it: The pan has to clear the crossmember, the ground and, on a 4x4, the front differential. Unconfirmed. Confirm for your car: FD (1993-2002) on Sikky mounts, a mid-sump pan (Sikky OP004M, 6 qt); other FD kits, an F-body rear-sump pan (GM 12628771). Confirm for your car: FC (1986-1992), an F-body rear-sump pan (GM 12628771) for your mounts. On an FC, confirm sway-bar spacers for your bar, and on an FC convertible confirm the rear subframe brace (often removed or replaced with a tube brace). FB (1979-1985): Unconfirmed. Rear sump, low profile; measure, and expect a crossmember notch. More: oil pan guide.
Options1 option
Compare 1 oil pan option
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Sikky FD RX-7 LS swap mid sump oil pan Community | OP004M | 643.98 2026-10-13 | Unconfirmed. Confirm for your car. FD with Sikky mounts only: mid sump, 5 1/2 in deep, 6 qt. Included in the Sikky Stage 3 FD package and sold separately. Confirm the add-ons for your car: pickup 12558251, dipstick 12625031 or 12669528, and RK001. Other kits: confirm for your car (GM 12628771). Doesn't fit: Not for FB/FC; not with Samberg/Ronin/Hinson subframes. for FD only | Check price & fitment | In production |
Only 1 option found so far for the RX-7. Know another? Tell us →
Steering
1 option so far · $142.79Why you need it: The engine and headers have to clear the steering shaft and box, and some swaps need a new shaft or box to make room. The FD power steering line kit is left-hand drive only. More: steering shaft and box clearance.
Our pick1 option
Only 1 option found so far for the RX-7. Know another? Tell us →
Ready for the next step when you've picked where the engine sits and an oil pan that clears it.
Next: transmission & driveline →3Transmission & drivelinePick the transmission and how it shifts, then the parts behind it · 3 parts
Transmission adapter & clutch
3 options · $382.49–$600Why you need it: An LS needs its own bellhousing or adapter and the right flexplate or flywheel, and an electronic transmission needs a computer to shift it. An LS1-style T56 bolts on and puts the shifter in the factory FD spot; a CD009 needs an adapter plate and the stock bellhousing cut off. More: transmission guide.
Options3 options
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Compare 3 transmission adapter & clutch options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Sikky Manufacturing (via Wiring Specialties Stage 3 kit) No adapter needed - kit designed around LS1-style T56 Listed | — | FD RX7 w/ LS1-style T56 (shifter lands in factory location) Doesn't fit: Shifter relocation kit not needed. for FD only | Direct from Sikky Manufacturing (via Wiring Specialties Stage 3 kit) | ||
| Sikky Manufacturing Sikky Mazda FD RX7 LS1 Master Cylinder Adapter Kit Listed | MCK104 | 382.49 2026-10-01 | FD RX7 LS1/T56 clutch hydraulics Doesn't fit: This is a clutch master cylinder kit, not a brake booster upgrade. for FD only | Buy | |
| Collins Performance Technologies LSX to CD009 adapter plate Listed | — | 600.00 2026-09-28 | LS engines to CD001-CD009 Doesn't fit: Requires cutting the stock bellhousing; not a bolt-on kit. Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In production |
Crossmember
2 optionsWhy you need it: The transmission mount usually moves, and the crossmember sets the driveline angle. Sikky's FD crossmember takes a T56, T56 Magnum or CD009; check it against your mount set. More: getting driveline angles right.
Our pick and alternatives2 options
Compare 2 crossmember options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Sikky Manufacturing Mazda RX7 FD T56/CD009 Transmission Crossmember Listed Our pick · for FD only | — | Mazda RX7 FD w/ T56, T56 Magnum, or CD009 Doesn't fit: Verify against your engine mount set before ordering. for FD only | Check price & fitment | ||
| Wiring Specialties Trans Mount (Sikky Stage 3 FD kit) Listed | — | FD RX7 w/ T56 or T56 Magnum Doesn't fit: Kit-only - not sold as a standalone crossmember. for FD only | Direct from Wiring Specialties |
Driveshaft
2 options · $859–$1,242.98Why you need it: A different transmission is almost always a different length, so plan on a custom-length driveshaft. The Fisch FD shaft is for CD009-family swaps, and a stock-FD carbon shaft isn't measured for an LS swap. More: driveshaft length and angles.
Our pick and alternatives2 options
Compare 2 driveshaft options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Fisch Racing Tech Mazda RX7 FD to CD009/CD00A 1-piece Aluminum Driveshaft Listed Our pick · for FD only | 9-Q5-0008 | 859.00 2026-10-01 | Mazda RX7 FD w/ CD009/CD00A Doesn't fit: Built for CD009-family swaps; confirm fit for T56. for FD only | Check price & fitment | |
| The Driveshaft Shop DSS Mazda 1993-1995 (FD) Manual Carbon Fiber Driveshaft Listed | MZSH5-C | 1242.98 2026-10-01 | Mazda RX-7 1993-1995, manual transmission Doesn't fit: Listed for the stock FD manual drivetrain - not a measured LS swap shaft. for FD only | Check price & fitment |
Ready for the next step when you've picked the transmission and how it's controlled, and know the crossmember, driveshaft and flexplate or bellhousing it needs.
Next: accessories & cooling →4Accessories & coolingOne accessory spacing, then cooling and A/C · 3 parts
Accessory drive
2 options · $239.98–$2,299.95Why you need it: The balancer, water pump, brackets and pulleys must all be one spacing, or the belt won't line up. The usual drives are a Holley mid-mount system or a serpentine kit built around a Sanden 508. More: accessory drive guide.
Options2 options
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Compare 2 accessory drive options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Bills Hot Rod Co LS swap serpentine front drive kit, raw Listed | 91668046-RAW | 239.98 2026-09-29 | Gen III/IV LS Doesn't fit: Universal fit - modification may be required Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | |
| Holley GM LS engine mid-mount accessory system, black Listed | 20-186BK | 2299.95 2026-09-27 | GM LS engines Doesn't fit: Universal fit - modification may be required Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Buy |
Cooling
2 options · $379.95–$1,408.35Why you need it: LS water pumps put both hoses on the passenger side and the engine needs a steam line, so the radiator needs LS-style ports or an adapter. The Mishimoto FD radiator is made around the rotary, so check hose routing and fan fit; the LS swap radiator kit includes fan and shroud. More: radiator, fans and steam line.
Our pick and alternatives2 options
Compare 2 cooling options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Sikky Manufacturing LS Swap Radiator kit, FD RX7 Listed Our pick · for FD only | RAD01 | 1408.35 NZD 2026-10-01 | Mazda FD RX7 w/ LS swap Doesn't fit: Special order - verify fitment with seller before ordering. for FD only | Check price & fitment | |
| Mishimoto Performance Aluminum Radiator, Mazda RX-7 1993-1995 Listed | MMRAD-FD-93 | 379.95 2026-10-01 | Mazda RX-7 1993-1995 (FD, manual trans) Doesn't fit: MT only. for FD only | Buy |
A/C
1 option so far · $129.99Why you need it: Where the compressor mounts (high or low) can decide frame, fender and header clearance, so pick it before you buy brackets. A swap bracket moves the Sanden 508 compressor away from the frame rail. More: accessory drive guide.
Options1 option
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Compare 1 A/C option
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Bills Hot Rod Co LS Swap A/C Compressor Bracket, Raw Steel Listed | 91668042-RAW | 129.99 2026-10-01 | Gen III/IV LS Doesn't fit: Compressor and belt not included. Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Bills Hot Rod Co |
Only 1 option found so far for the RX-7. Know another? Tell us →
More: Accessory drive guide · Cooling guide
Ready for the next step when you've picked one accessory spacing, with the balancer, water pump and brackets to match.
Next: exhaust →5ExhaustHeaders or manifolds that clear where the engine sits · 1 part
Headers & exhaust
5 options · $550–$1,085Why you need it: Headers are shaped around one chassis's frame, steering and floor, so they have to be made for your vehicle and engine position. Jags That Run headers won't fit with a 4L60E; FC cars need the heat shields trimmed and some need tunnel work. More: headers and exhaust by chassis.
Our pick and alternativespick + 2 of 5
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Compare 5 header & exhaust options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Sikky Manufacturing SIKKY MAZDA RX7 SWAP 1 7/8 in HEADERS Listed Our pick · for FD only | — | 1063.99 2026-10-01 | Mazda FD RX7 w/ Sikky LSX Swap Kit Doesn't fit: Fitment not guaranteed when used in conjunction with a competitor's product. for FD only | Check price & fitment | |
| Jags That Run Mazda RX7 LS1 VI Long Tube Headers — 1-3/4" / Mild Steel Listed | RX7-404 | $930 2026-09-30 | FD (1993-1995) and FC (1986-1991), LS1, T56. FC heat shields need to be trimmed. Mild steel is RX7-404. Ceramic is RX7-404c. Doesn't fit: FB. Will not fit cars using 4L60-E transmissions. for FC / FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In stock |
| Jags That Run Mazda RX7 LS1 VI Long Tube Headers — 1-3/4" / Ceramic Listed | RX7-404c | $1,085 2026-09-30 | FD (1993-1995) and FC (1986-1991), LS1, T56. FC heat shields need to be trimmed. Mild steel is RX7-404. Ceramic is RX7-404c. Doesn't fit: FB. Will not fit cars using 4L60-E transmissions. for FC / FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Check price & fitment | In stock |
| Hinson Hinson stainless steel LS1 RX7 headers, used Listed | — | 550.00 2026-10-01 | FD RX7 LS swaps; fit FC with no clearance issues Doesn't fit: Built for the FD - confirm with your kit vendor before buying used. for FC / FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Hinson | |
| Jags That Run Mazda RX7 LS1 VI Long Tube Headers Listed | — | 930.00 2026-10-01 | FD (1993-1995) and FC (1986-1991), LS1, T56. FC heat shields need to be trimmed. Mild steel is RX7-404. Ceramic is RX7-404c. Doesn't fit: FB. Will not fit cars using 4L60-E transmissions. for FC / FD only | Check price & fitment |
More: Headers & exhaust guide
Ready for the next step when you've picked headers or manifolds that clear where your mounts put the engine.
Next: fuel system →6Fuel systemPump, lines and pressure for the LS · 1 part
Fuel system
2 options · $239Why you need it: An LS runs about 58 psi of fuel pressure; a carbureted system runs 5–7 psi. The stock FD high-pressure pump can stay, run through a bypass switch on the factory relay. More: fuel system & E85 guide.
Options2 options
Compare 2 fuel system options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Wiring Specialties Stage 3 kit fuel pump bypass switch (uses OEM Mazda high-pressure pump) Listed | — | FD RX7 w/ LSx swap (retains OEM pump relay on chassis fuse box) Doesn't fit: Requires the OEM RX7 body harness and fuse boxes to be unmodified. for FD only | Direct from Wiring Specialties | ||
| DeatschWerks 93-95 RX7 Fuel Rails Listed | DWK7-700 | 239.00 2026-10-01 | Mazda RX-7 1993-1995 (13B) Doesn't fit: These rails are for the 13B-REW rotary, not an LS engine. for FD only | Check price & fitment |
More: Fuel & E85 guide
Ready for the next step when you've decided return or returnless, and sized the pump and injectors for your power and fuel.
Next: wiring, computer & tune →7Wiring, computer & tuneHarness, computer and tune matched to the engine · 1 part
Harness & computer
9 options · $750–$4,169Why you need it: The computer and harness have to match the engine's crank signal (24x or 58x) and throttle (cable or drive-by-wire), and the tune has to turn VATS off. More: 24x vs 58x, and which harness.
Options3 of 9
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why.
Compare 9 harness & computer options
| Maker / product | Part # | Price | Fits / notes | Where | Status |
|---|---|---|---|---|---|
| Wiring Specialties RX7 LS1 Swap Wiring Harness Listed | WRS-PROLS1-RX7 | $899 2026-09-29 | USDM LHD FD (1993-1995). Doesn't fit: FB and FC. for FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Wiring Specialties | |
| Wiring Specialties RX7 FD wiring harness, LS1 cable throttle and LS1 PCM Listed | WRS-PROLSxG4-RX7 | $999 2026-09-29 | USDM LHD FD (1993-1995). Doesn't fit: FB and FC. for FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Wiring Specialties | |
| Wiring Specialties Mazda RX7 LS3 Swap Wiring Harness Listed | WRS-PROLS3-RX7 | $999 2026-09-29 | USDM LHD FD (1993-1995). Doesn't fit: FB and FC. for FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Wiring Specialties | |
| Wiring Specialties Mazda RX7 FD LS3 Swap Wiring Harness for Haltech Elite 2500 Listed | — | $1,259 2026-09-29 | for FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Wiring Specialties | |
| Wiring Specialties Mazda RX7 FD LS3 Swap Wiring Harness for LINK Xtreme ECU Listed | — | $1,259 2026-09-29 | for FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Wiring Specialties | |
| Wiring Specialties RX7 FD Stage 3 LS1 Swap Kit Listed | — | $4,169 2026-09-29 | for FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Wiring Specialties | |
| Wiring Specialties LS1 / Vortec Wiring Harness for Mazda RX7 FD - PRO SERIES Community | — | 899.00 2026-10-01 | USDM LHD FD Mazda RX7 (1993-1995) w/ LSx swap Doesn't fit: Retains factory gauges only with OEM RX7 body harness and fuse boxes UNMODIFIED. for FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Wiring Specialties | |
| Wiring Specialties (Sikky Stage 3 kit) SIKKY Stage 3 Mazda RX7 LS1 Swap Kit w/ PRO Series Wiring Harness Community | WRS-SIKKY-RX7 | 4169.00 2026-10-01 | Mazda RX7 FD w/ LS1 Doesn't fit: Designed for left hand drive vehicles. for FD only Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Wiring Specialties (Sikky Stage 3 kit) | |
| Speartech Fuel Injection Systems Stand-alone LS1 harness (new) Community | — | 750.00 2026-10-01 | LS1 swaps (universal stand-alone service) Doesn't fit: No post-cat O2s, A.I.R. pump, purge canister, or fuel tank evap interface. Unconfirmed Confirm this We have not confirmed this part on this vehicle yet. If you installed it, tell us what you used and why. | Direct from Speartech Fuel Injection Systems |
New Already have a tune in it? Send us the file for a free Tune Report: what to fix first, in plain English, within 1 business day. See what you get →
More: ECU comparison · Tuning
That's the last step. Put your picks together in the planner.
Plan your exact combination →Swap kits sold for this vehicle
Why it matters: the kit's mounts decide where the engine sits, and that decides oil pan, header and crossmember clearance. Confirm the kit lists your exact years. More: engine mounts and swap kits.
- — Sikky
Questions about this swap
Every LS swap also needs
An oil pan that clears
Compare GM LS pans by sump position and depth.
Accessory drive spacing
F-body, car, truck and Corvette offsets.
Fuel system sizing
Injector and pump sizing for your power goal.
A harness, computer and tune
VATS delete, 24x vs 58x, drive-by-wire, harness makers.
A transmission
4L60E to 8HP70 behind an LS.