Honda K20Z3 Engine for Sale | OEM Used 8th Generation Civic Si 2.0L i-VTEC Inline-4 | 197 HP, 8,000 RPM Redline
$1,999.00
At a Glance
- Condition: OEM used, all 4 cylinders compression tested
- Availability: In stock, Honda K20Z3 engines available
- Shipping: Free shipping to all 50 states via standard freight, 5 to 10 business days
- Donor vehicle confirmed (8th gen Civic Si coupe / sedan or Acura CSX Type-S)
- i-VTEC operation verified
- VTC (Variable Timing Control) actuation confirmed
- Oil pressure within spec at idle and operating temperature
- Cylinder head and top-end visual inspection
- Donor mileage documented where verifiable
- No core charge required
- Backed by a 15 day replacement warranty against internal defects
Description
About the Honda K20Z3 Engine
The K20Z3 engine is a high-performance naturally aspirated Inline-4 from Honda legendary K-series. Known for its DOHC i-VTEC system, it delivers strong high-rpm power and the engaging high-revving driving character that defines Honda performance. This K20Z3 engine for sale at Part Nests is favored for its reliability and tunability, found in the iconic 8th generation Honda Civic Si and related K-series performance models.
The K20Z3 in the Honda K-Series Family
| Detail | Description |
|---|---|
| K20A | JDM Integra Type R DC5, Civic Type R EP3 / FD2; the high-output JDM-spec K20 |
| K20A2 | Acura RSX base (200 HP, 2002-2006) |
| K20Z1 | Acura RSX Type-S (210 HP, 2005-2006); often considered the pinnacle of US-market K20 |
| K20Z3 | 8th gen Honda Civic Si (2006-2011) at 197 HP, Acura CSX Type-S |
| K24Z7 | 9th gen Civic Si (2012-2015), the K20Z3 successor with larger 2.4L displacement |
Key Features
- DOHC i-VTEC: Honda intelligent Variable Valve Timing and Lift Electronic Control on the intake camshaft varies valve timing AND lift profile based on RPM, delivering strong low-end torque AND high-rpm power.
- High-revving: 8,000 RPM redline with peak power at 7,800 RPM. Aluminum rotating components enable consistent high-rpm operation.
- All-aluminum construction: Block and head both aluminum, approximately 245 lbs dry.
- 11.0:1 compression: Improves thermal efficiency and contributes to strong specific power output.
- Honda PGM-FI multi-point injection: Precise fuel control for each cylinder.
- 4-into-1 stainless exhaust manifold: Minimizes back pressure for better high-rpm breathing.
JDM Performance Engine Context
The Honda K20Z3 (this listing, 2.0L Inline-4) represents the modern Honda K-series naturally aspirated high-revving Inline-4, the philosophical descendant of the legendary B-series VTEC engines (B16, B18C) of the 1990s. For JDM performance comparison: the Toyota 2JZ (our vaz112 listing, 3.0L Inline-6 cast iron closed-deck) is the forced-induction-capable platform used in Supra MK4 / Aristo / JZX-series. The two engines represent different JDM performance philosophies: K20Z3 for high-revving NA character and weight reduction (~245 lbs dry vs 2JZ ~540 lbs); 2JZ for forced induction and high-horsepower targets (1,000+ HP on stock internals). Both have massive aftermarket support and are popular swap engines.
K20Z3 Engine Fits
- Honda Civic Si 8th generation (2006-2011 FA5 coupe and FG2 sedan), the dominant K20Z3 application
- Acura CSX Type-S (Canadian Acura sedan, equivalent to Civic Si)
- Acura TSX (some configurations)
- Honda Civic Type R FD2 (some markets used K20Z3 variants)
- Honda Accord Euro R (Japanese market sedan)
- K-Swap applications: Older Civic chassis (EG, EK, EM, EP) and various non-Honda swaps
Legal and Compliance
Our K20Z3 engines comply with federal emission regulations for engine swaps in 49 states. California Air Resources Board (CARB) compliance requires additional verification for California swap applications; consult your local emissions authority before ordering for California use.
Common K20Z3 Maintenance Considerations
- Oil service: Honda-approved 5W-30 synthetic, 5,000-7,500 mile change interval for street use
- VTC actuator: Known K-series service item; replace at 80,000-120,000 miles to prevent the characteristic startup rattle
- Timing chain: K-series uses a timing chain (no belt service); chain stretches at very high mileage
- Valve adjustment: Periodic valve clearance check per Honda service interval
- Spark plugs: NGK iridium per Honda spec, 60,000-100,000 mile interval
Vehicle Compatibility
| Vehicle | Compatibility |
|---|---|
| Honda Civic Si FA5 (Coupe, 2006-2011) | Dominant K20Z3 application |
| Honda Civic Si FG2 (Sedan, 2006-2011) | Sedan version of 8th gen Civic Si |
| Acura CSX Type-S | Canadian equivalent to Civic Si |
| Acura TSX | Some configurations |
| Honda Civic Type R FD2 | JDM Civic Type R |
| Honda Accord Euro R | JDM Accord variant |
| K-Swap Applications | Common swap engine for older Civic chassis (EG, EK, EM, EP) |
Why Buy From Part Nests
- Donor vehicle confirmed (Civic Si FA5 coupe, FG2 sedan, Acura CSX Type-S, or other K20Z3 application)
- All 4 cylinders compression tested
- i-VTEC operation verified
- VTC actuator condition documented (known K-series service item)
- Top-end condition documented
- Free standard freight delivery to all 50 states
- 15 day replacement warranty on internal defects
- Honda K-series-experienced support team on the phone
- Call (855) 634-4447 to confirm Honda K20Z3 (the 8th gen Civic Si 2.0L i-VTEC variant, 197 HP at 7,800 rpm, 8,000 rpm redline), donor vehicle (Civic Si FA5 coupe, FG2 sedan, Acura CSX Type-S, Acura TSX, Civic Type R FD2, or Accord Euro R), VTC actuator condition (known K-series service item, replace at 80,000-120,000 miles), and JDM performance context (K20Z3 Inline-4 vs Toyota 2JZ Inline-6 per vaz112 forced-induction-capable) before ordering
15 Day Replacement Warranty
Every used Honda K20Z3 engine purchased through Part Nests carries a 15 day replacement warranty starting on the delivery date.
What Is Covered
- Internal defects already present when the engine arrives
- Compression failures on any of the 4 cylinders beyond what was disclosed
- Cylinder head crack failures within 15 days from installation
- i-VTEC system failures within 15 days from installation
- VTC actuator failures within 15 days from installation
- Timing chain failures within 15 days from installation
- Connecting rod, lifter, or bearing failures within 15 days from installation
What Is Not Covered
- Damage caused during installation
- Damage from incorrect oil viscosity or extended oil change intervals (Honda-approved 5W-30 synthetic, 5,000-7,500 mile change for street use)
- Damage from operating with worn VTC actuator that causes startup rattle (preventive replacement at 80,000-120,000 miles is recommended)
- Damage from sustained redline operation without supporting modifications
- Damage from forced induction conversion without proper supporting modifications (K20Z3 in OE form is naturally aspirated only)
- Damage from aggressive aftermarket tuning beyond Honda-approved fuel maps
- External components (ECM, harness, intake manifold, exhaust manifold, starter, alternator, water pump, transmission, AC compressor) unless itemized
- Labor expenses of any kind
To start a warranty claim, reach us within 15 days of delivery at (855) 634-4447.
- All 4 Cylinders Tested: Compression results documented before payment
- Donor Vehicle Confirmed: Civic Si FA5 / FG2, Acura CSX Type-S, or other K20Z3 application
- i-VTEC Operation Verified: Variable valve timing and lift function tested
- VTC Actuator Condition Documented: Known K-series service item inspected
- Timing Chain Condition Documented: Lifetime component checked for stretch
- 15 Day Replacement Cover: Internal defects protected from delivery onward
Additional information
| aspiration | Naturally aspirated |
|---|---|
| bore-x-stroke | 86 mm x 86 mm |
| compression-ratio | 11.0:1 |
| configuration | Inline-four cylinder |
| cooling-system | Liquid-cooled |
| fuel-system | Multi-point fuel injection (MPFI) |
| valvetrain | Dual overhead camshaft (DOHC), i-VTEC on intake camshaft |
The 8th generation Civic Si 2.0L i-VTEC variant. The K20Z3 (this listing) is part of Honda K-series engine family that began in 2001. K20A is the JDM Integra Type R DC5 / Civic Type R EP3 / FD2 high-output. K20A2 is the Acura RSX base (200 HP, 2002-2006). K20Z1 is the Acura RSX Type-S (210 HP, 2005-2006), often considered the pinnacle of US-market K20. K20Z3 is the 8th gen Civic Si (2006-2011, 197 HP) and Acura CSX Type-S. K24Z7 is the 9th gen Civic Si (2012-2015) K20Z3 successor with 2.4L displacement. Each K-series variant has specific cam profiles, intake design, compression, and ECU calibration.
Variable Valve Timing and Lift Electronic Control with intelligence. i-VTEC varies both intake valve timing AND lift profile based on engine RPM, with electronic ECU control. At low RPM, i-VTEC operates on a milder cam profile optimized for low-end torque and fuel efficiency. Above approximately 5,800 RPM, i-VTEC engages a more aggressive cam profile with greater lift and duration optimized for high-rpm breathing. The transition produces the characteristic Honda VTEC engagement felt as a second power surge.
Known K-series service item; preventive replacement recommended. The VTC (Variable Timing Control) actuator is hydraulically-actuated and varies intake camshaft phase angle relative to the crank, working with i-VTEC for full Variable Valve Timing functionality. At high mileage (typically 80,000-120,000 miles), the VTC actuator can develop internal wear that causes loss of oil pressure during shutdown. On next cold startup before oil pressure builds, the actuator moves slightly, producing a 1-3 second rattle from the timing chain area. Preventive replacement at 80,000-120,000 miles is the standard K-series community recommendation. Ignoring the rattle long-term can cause timing chain and cam timing problems.
Civic Si 8th gen primary, plus Acura CSX Type-S and others. Honda Civic Si FA5 (Coupe, 2006-2011) is the dominant K20Z3 application. Honda Civic Si FG2 (Sedan, 2006-2011). Acura CSX Type-S is the Canadian Acura sedan equivalent to Civic Si. Acura TSX (some configurations). Honda Civic Type R FD2 (some markets used K20Z3 variants). Honda Accord Euro R (JDM). K-Swap applications: common swap engine for older Honda Civic chassis (EG 1992-1995, EK 1996-2000, EM 2001-2005, EP 2001-2005).
Honda Inline-4 high-revving NA vs Toyota 2JZ Inline-6 forced-induction-capable. The Honda K20Z3 (this listing) represents the Honda philosophy of high-revving naturally aspirated Inline-4 with engaging shift-and-rev character. The Toyota 2JZ (our vaz112 listing) represents the alternative JDM philosophy of forced-induction-capable Inline-6 with stratospheric tuning ceiling. K20Z3 for NA revs and weight reduction; 2JZ for forced induction and high HP targets. Both have massive aftermarket support and serve different builder preferences.
Federal 49-state compliant but California requires additional verification. K20Z3 engines comply with federal emissions for engine swaps in 49 states. California CARB compliance for engine swaps requires the swap engine be no older than the donor chassis and retain all OE emissions control equipment. For 2006-2011 Civic Si chassis with K20Z3 OE engine, K20Z3 from a compatible year donor is generally compliant. K-swap into older chassis (EG, EK, EM, EP) is more complex and may require a referee inspection. Consult your local California emissions authority before ordering.
Approximately 280-300 HP on stock internals with bolt-ons. Stock K20Z3 internals (forged crank, sintered rods, hypereutectic pistons) handle 280-300 HP at the wheels with bolt-on modifications (cold air intake, exhaust, ECU calibration, header). Beyond 300 HP typically requires forced induction along with built internals: forged pistons (Wiseco, JE), upgraded rods (Manley, Eagle), ARP head studs, larger injectors, proper engine management. Built K20Z3 with forced induction can produce 500-600 HP at the wheels.
No. There is no core return required.
2 reviews for Honda K20Z3 Engine for Sale | OEM Used 8th Generation Civic Si 2.0L i-VTEC Inline-4 | 197 HP, 8,000 RPM Redline
Related products
Augustus M. –
Got a K20Z3 for a 2008 Honda Civic Si Coupe (FA5) replacement after the original developed compression issues at 145,000 miles. Donor correctly identified as Civic Si FA5 (NOT the FG2 sedan or CSX Type-S), all 4 cylinders compression tested, i-VTEC verified, VTC actuator condition documented clean. Honest pre-purchase information about the VTC actuator startup rattle (known K-series service item, preventive replacement at 80,000-120,000 miles) and the JDM context (K20Z3 Inline-4 high-revving NA vs Toyota 2JZ Inline-6 per vaz112 forced-induction-capable).
Penelope J. –
Sourced a K20Z3 for a K-swap project into a 2000 Civic EM chassis from a JDM-import donor. Engine identified as K20Z3 from Acura CSX Type-S donor (Canadian Acura sedan equivalent to Civic Si), i-VTEC verified, mileage documented from JDM-import. Honest pre-purchase information about California CARB compliance complexity for K-swap into older chassis (federal 49-state compliant but California requires referee inspection) and K20Z3 power potential (280-300 HP on stock internals with bolt-ons, 500+ HP with forced induction and built internals).