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Complete 501 Series Performance Head W/ Seats And Guides 40 Intake 35.5 Exhaust Holiday Cheer Edition [1C3EQRtT]

$44.99 $143.99 -69%

501 Series Performance Head W/ Seats and Guides Elevate your engine's performance with our 501 Series Performance Head, designed to meet the needs of serious enthusiasts. This comprehensive package includes seats, guides, and a 12mm plug hole, ensuri

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Complete 501 Series Performance Head W/ Seats And Guides 40 Intake 35.5 Exhaust Holiday Cheer Edition [1C3EQRtT]

501 Series Performance Head W/ Seats and Guides

Elevate your engine's performance with our 501 Series Performance Head, designed to meet the needs of serious enthusiasts. This comprehensive package includes seats, guides, and a 12mm plug hole, ensuring a seamless integration with your engine setup. Crafted from high-quality AA 501 Series casting, this head is built to deliver exceptional performance and durability.
  • Seating and guides for precise valve control
  • 12mm plug hole for easy installation and maintenance

Unmatched Performance Features

Our 501 Series Performance Head is engineered to provide maximum performance and efficiency. Key features include an increased intake surface for larger ports, a modernized combustion chamber for improved head flow, and a second full fin for deeper fly cutting. These enhancements allow you to achieve almost any desired head cubic centimeter volume. Additional features include blocked-off rocker stud bosses to prevent oil leaks and long reach 3/4 inch spark plugs to reduce cracking.
  • Increased intake surface for larger ports
  • Modernized combustion chamber for enhanced flow
  • Second full fin for deeper fly cutting

Superior Quality and Specifications

Experience the benefits of our 501 Series Performance Head with its precise valve size of 40x35.5 and a head bore of 85.5. The 12mm plug hole is compatible with the NGK replacement number D8EA, ensuring easy replacement and maintenance. This head comes with a total of 55 cubic centimeters, providing the perfect balance between power and efficiency. Trust in the quality and reliability of our 501 Series Performance Head for your engine's next upgrade.
  • Valve size: 40x35.5
  • Head bore: 85.5
  • Plug size: 12mm (NGK D8EA compatible)
  • Total head cubic centimeters: 55

What Our Customers Say

January 19, 2026

Absolutely no complaints!

The quality for the cost is unmatched.

- Scarlett H..

January 19, 2026

Absolutely no complaints!

A great item. Well made.

- Tori Z..

January 19, 2026

Absolutely no complaints!

A brilliant and useful item.

- Dominic M..

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