M311 273cc LS3 Cylinder Head – Impregnated – (set)

M311 273cc LS3 Cylinder Head – Impregnated – (set)

M311 273cc LS3 Cylinder Head – Impregnated – (set)

- % OFF
  • Competition Use Only, Not Legal for Road Use

  • Details

  • Return Policy


Cylinder heads impregnated with resin are desirable when there is an expectation or need of enduring severe conditions or high pressure applications. FED processes limited batches of impregnated castings from time to time. Please note impregnated heads may have less visual luster in the ports and can be a hassle to weld in the event of rapid engine disassembly at the 60-foot mark.

  • Fully CNC ported, 72cc chamber volume
  • 273cc intake port, 112cc exhaust port and 11° valve angle
  • High Quality Components:
    • Black Nitride Stainless Steel Severe Duty Valves
    • Custom PAC .700” Lift Valve Springs
    • Titanium Retainers
  • O-Ringed Exhaust Ports (Hi-Temp Silicone O-rings Included)
  • 2″ Headers Recommended
  • Sold Per Set

Return Policy for The RPM Store

Thank you for choosing The RPM Store. Our return policy is designed to provide clarity and fairness to our valued customers.


Eligibility for Return:

Standard items are eligible for return within 30 days from the delivery date. However, customized items, including electrical components, are not eligible for return. We believe in transparency regarding the return eligibility of our products.


Final Sale and Exclusions:

All purchases at The RPM Store are considered final, and no partial refunds or exchanges will be considered. Customized items, especially those involving electrical components, fall under this category and are exempt from the standard return policy.


Refund Process:

For eligible returns, refunds will be processed within 2-4 weeks from the date the returned item is received. We appreciate your patience as we ensure a thorough and accurate refund process.


Restocking Fee:

All return orders, regardless of the reason for return, will be subject to a 30% restocking fee. This fee helps cover the costs associated with processing and restocking returned items.


Return Procedure:

To initiate a return, please contact our customer support team at 1-928-323-1996]. Include a copy of the original receipt with your return. Properly package your return to prevent damage during transit, as we cannot be held responsible for improperly packed returns.


Communication and Legal Compliance:

This return policy is available on our website for your reference. For any questions or clarifications, feel free to contact our customer support team. Rest assured, our return policy is crafted to abide by all applicable consumer protection laws in the state of California.


Feedback and Updates:

We welcome your feedback on our return process, and we may periodically update this return policy based on customer feedback and evolving business needs.

Thank you for choosing The RPM Store. We appreciate your trust in our products and our commitment to providing a transparent and fair return experience.



The RPM Store Team

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Call: 928-323-1996

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Servicing: Yuma Arizona and vicinity

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