1:1 Race Engines | L15B7 Performance Short Block
Precision Built. Race Proven. Assembled In-House.
Engineered for the 2016–2021 Honda Civic 1.5L Turbo (L15B7), our 1:1 Race Engines performance short blocks are designed to deliver the strength, reliability, and performance required for high-horsepower applications.
Drawing on our extensive experience building and tuning Honda's K-series and Civic Type R platforms, we've applied our proven engine-building techniques to the L15B7. The result is a professionally blueprinted, high-performance short block utilizing premium components without the premium price tag.
BUILD TIMES & AVAILABILITY
STANDARD OEM BLOCK: 1–2 WEEKS
CSS REINFORCED BLOCK: 6–8 WEEKS
Build times are estimated from the date of purchase and may vary depending on component availability and machining schedules. Shipping transit time is not included.
Every short block is built to order in-house at 1:1 Tuning, with careful attention to component measurements, clearances, and assembly quality.
What's Included
Every 1:1 Race Engines L15B7 short block includes:
Engine Components
-
Brand-new OEM Honda engine block and crankshaft (unless supplying an approved customer core)
-
1:1 Spec Traum HD forged pistons and rings — 10.5:1 compression ratio
-
Your choice of Brian Crower, InlinePro No-Notch, or Saenz connecting rods
-
OEM Honda engine bearings, crank trigger, and oil jets
Precision Machining & Assembly
-
Cylinder honing matched to actual piston measurements
-
Individual piston ring gap measurement and adjustment
-
Main and connecting rod bearing clearance verification
-
Inspection and measurement of all critical engine components
-
Deburring of critical edges and surfaces
-
In-house blueprinting, balancing, and professional assembly
-
Secure packaging for shipment
Optional CSS Cylinder Support System
For customers pursuing more aggressive power levels and higher boost pressures, we offer an optional Cylinder Support System (CSS) reinforcement.
We recommend considering the CSS upgrade for applications operating above approximately 25 PSI, particularly those intended for sustained high-cylinder-pressure operation.
While the OEM cylinder sleeves can support substantial power, the CSS provides additional cylinder wall support to help reduce the risk of sleeve distortion or cracking under demanding conditions.
CSS builds include an additional 0.5 mm cylinder overbore to establish proper cylinder geometry and finished bore dimensions following installation of the billet cylinder support.
Select the CSS upgrade from the product options before adding your engine to the cart.
Customer-Supplied Engine Cores
Already have an L15B7 engine?
We offer the option to build your existing engine block and crankshaft rather than purchasing new OEM components.
Customer-supplied cores must be inspected and approved before assembly. Additional machining or replacement components may be required depending on their condition.
Contact 1:1 Tuning for a custom build quote.
Shipping Information
IMPORTANT: If you require your completed short block to be shipped, please select the Shortblock Shipping option during checkout.
All completed engines are carefully packaged to help protect components during transit.
Product photos may show the optional CSS reinforcement. CSS is not included unless selected.
Race Engine Disclaimer
By purchasing a 1:1 Race Engines short block, the customer acknowledges and agrees to our Race Engine Disclaimer, including the terms, conditions, and limitations associated with performance engine components.