cylinder head limited warranty

Cylinder Head Limited Warranty Coverage

Our cylinder head Limited warranty covers defects in workmanship under normal use for a period of 12 months from the date of purchase.


Register your engine within 30 days of purchase.  Failure to do so will void your warranty. 

Terms and Conditions

This cylinder head warranty is valid only if:
– The cylinder head is installed by a D&J Precision approved technician.
– Exclusions apply for misuse, unauthorized modifications, lack of proper maintenance, abuse, neglect, overloading, overheating, fuel system failures, or tuning. D&J Precision Machine can only cover workmanship-style errors. Cracks of any kind will not be covered.
– If a cylinder head is misdiagnosed by the shop, D&J Precision Machine will not be responsible for any costs associated with the misdiagnosis. The customer and/or shop will be responsible for D&J Precision Machine’s time, materials, and shipping if misdiagnosed.

Claim Process

  1. Contact Us: Report issues to our customer service at 740-297-7223 or
    2. Submit Documentation: Provide proof of purchase, registration, maintenance records, and pictures and/or video of the issue. No warranty claims will be approved without photos and/or video documentation.
    3. Inspection: Have the cylinder head inspected by an authorized dealer.
    4. Estimate: Provide an estimate before any work is performed. If any work is performed before approval from D&J Precision Machine, we will not pay for the work.
    5. Approval: Receive written approval or denial of the claim.

Repair or Replacement

Approved claims will result in repair or replacement of defective parts or the cylinder head. Labor costs up to $100 per hour using flat rate will be covered for approved claims. Shipping costs for approved claims will also be covered.



Our liability is limited to repair or replacement. We are not liable for consequential or incidental damages.

Contact Information

For cylinder head warranty claims, contact:
– Phone: 740-297-7223
– Email:
– Mailing Address: D&J Precision Machine, 706 Woodlawn Avenue, Cambridge, OH, 43725