Honda Civic 1.8 SOHC Engine Code R18A1 VVTi 4 Cyl Cylinder Head Cast# RNA

 Each head is **fully assembled** and ready to install making your rebuild or repair faster and easier. We deliver quality and reliability you can count on, backed by over 30 years of experience and a 2-year unlimited mileage warranty. ### Honda Civic 1.8 SOHC Engine Code R18A1 VVTi 4 Cyl Cylinder Head Cast\# RNA   ## Honda Civic 1.8 SOHC Engine Code R18A1 VVTi 4 Cyl Cylinder Head Cast\# RNA Upgrade your Honda Civic’s performance with this **Honda Civic 1.8 SOHC R18A1 VVTi Cylinder Head**. Compatible with 2006-2008 Honda Civic models, this high-quality 4-cylinder head is designed to match the original factory specifications and improve efficiency and engine performance. Cast with precision (CAST# RNA), this cylinder head provides reliable operation and durability, making it an ideal replacement part. When ordering, please include the casting number for accurate matching. #### **Interchangeable Part Numbers:** - 10003-RNA-A00 ASSM - 10003-RNA-A01 ASSM #### **Key Features** - **Engine Code:** R18A1 - **Cylinder Configuration:** SOHC, 4-Cylinder - **VVTi technology:** For optimized engine efficiency - **Compatibility:** Made for Honda Civic 1.8 models (2006-2008) - **Cast Number:** Durable casting (CAST# RNA) for longevity - **Core return required for purchase.** #### **Fitment Data** **Year:** - 2006 - 2007 - 2008 - 2009 - 2010 **Make:** - Honda **Model:** - Civic **Engine Size:** - 1.8 AT (140 Hp) - 1.8 MT (140 Hp) - AMT 1.8 AT (140 Hp) ### **Clearwater Cylinder Head – Core Returns Policy** At Clearwater Cylinder Head, core returns help us provide top-quality, affordable cylinder heads. Returning your old core allows us to reuse key components like keepers, springs, and retainers, keeping our products reliable and cost-effective. #### **Core Charge Policy** A core charge is not billed upfront, but if the used core is not returned within **30 days** of receiving your new cylinder head, the core charge will be applied. #### **Why Core Returns Are Important** - Helps maintain OEM-quality cylinder heads. - Keeps prices low by reducing the need for new parts. - Supports sustainability by minimizing waste. #### **What to Return** To ensure a smooth remanufacturing process, please send back all parts originally included, such as: - Rocker arms - Camshafts (if applicable) - Any other hardware that came with your purchase #### **Simple & Free Return Process** - A prepaid core return label is included in a plastic sleeve on the box. - Pack your core with all its components, attach the label, and drop it off—no extra cost to you. - Returned cores are inspected and recycled for future use. #### **Working Together for Quality & Sustainability** By returning your core, you help us keep costs down and ensure a steady supply of high-quality cylinder heads. **If you do not have a core to return, please inquire about your options.** Thank you for supporting our process and the automotive industry! #### **Clearwater Cylinder Head, Inc. – Quality You Can Trust** At Clearwater Cylinder Head, Inc., we thoroughly clean, inspect, and pressure test all our cylinder heads. Using state-of-the-art equipment, we perform all seat and guide work, resurface the head to the required finish, and ensure a perfect seal between the valve and the seat with quality valve seals and vacuum testing. Therefore, our commitment to quality craftsmanship ensures that every cylinder head is ready for installation and built to last. Whether you’re replacing a worn cylinder head or upgrading for enhanced performance, our products meet or exceed OEM standards. #### **Shipping Information** Rates apply to the continental United States only. For Alaska, Hawaii, Guam, Virgin Islands, and Puerto Rico, please call or email for shipping rates. We ship worldwide, with insurance, packaging, and handling included in the shipping price. International bidders, please include your city, country, and postal code when inquiring about shipping fees. #### **Warranty Information** - **Coverage**: Clearwater Cylinder Head, Inc. provides two-year unlimited mileage parts warranty. A warranty card is included with your invoice. - **Terms**: Acceptance of the head includes acceptance of the warranty terms: - Heat tab must be intact and unaltered. - Returns must be accompanied by a copy of the invoice and a Return Authorization number. - Warranty covers parts only; no labor or incidental costs. - Warranty does not cover damage from improper installation, overheating, abuse, or neglect. #### **Contact Us** If you have a rare or hard-to-find cylinder head, let us rebuild it for you. We have thousands of heads in stock and deal with all makes and models. Our knowledgeable staff is ready to assist you. **Operating Hours:** Monday – Friday, 8 AM to 5 PM EST **Address:** 5100 Ulmerton Road #2, Clearwater, FL 33760, USA **Additionally, Learn More and Shop with Us** - **Honda 1.5-Liter Turbo Engine – Overview: Honda 1.5-Liter Turbo Engine** - **Check out this Honda Civic 1.5L VTEC Cylinder Head products –** **Clearwater Cylinder Heads – Honda Civic 1.5L VTEC Cylinder Head** ### What is the lead time on your cylinder heads? Lead times for cylinder heads can vary depending on availability and type. Remanufactured cylinder heads typically take up to two weeks to ship out, while new cylinder heads usually ship within a week or less. However, for rare or hard-to-find heads, additional time may be required to locate and prepare the part. If you have any questions or need a more accurate estimate for your specific application, please don’t hesitate to contact us—we’re happy to help. ### Core Return And Warranty Information Clearwater Cylinder Head, Inc. is committed to quality and stands behind its products with a 24-month warranty on both new and remanufactured cylinder heads, excluding commercial, industrial, performance, and marine use, which carry a 90-day warranty. This warranty covers defects in materials but does not include labor or damages from improper installation, overheating, or misuse. Proof of purchase is required, and all installations must be done by a qualified mechanic following approved procedures. A heat level indicator is installed on each head—tampering with or removing it voids the warranty. Repairs made without prior authorization or failure to notify us before removing the head will also void coverage. Core returns must be completed within 30 days to avoid additional charges. Returns are subject to a 20% restocking fee, and those made after 30 days are eligible for store credit only. For any questions or issues, please contact us before taking action. ### Why Choose Clearwater Cylinder Head? Trusted by professional rebuilders and DIYers nationwide, for over 30 years Clearwater Cylinder Head has sold over **100,000 cylinder heads** and built a reputation for dependable quality, expert craftsmanship, and unmatched service.