DJ Rock IV638 Engine Intake Valve

Engine Intake Valve for Nissan and Suzuki Applications

The DJ Rock IV638 engine intake valve is a direct-fit valvetrain replacement built for precise airflow control in the combustion chamber. With a nitride-coated finish, 35.7 mm valve head diameter, 6 mm stem diameter, and 97.2 mm overall length, it is specified for select Nissan Frontier, Nissan Altima, Nissan Sentra, and Suzuki Equator applications.

Use IV638 when you need an intake valve replacement that matches the original dimensions and operating requirements for the engine. This part number, IV638, is listed for multiple Nissan and Suzuki fitments, including 2002-2006 Nissan Altima and Sentra as well as 2005-2019 Nissan Frontier applications.

Key Features

• Nitride-coated valve surface for improved wear resistance and corrosion protection
• 35.7 mm valve head diameter for application-specific fitment
• 6 mm stem diameter for proper valvetrain alignment
• 97.2 mm overall length for direct replacement use
• Premium grade intake valve construction
• 1 lock groove design

Detailed Product Overview

DJ Rock IV638 is an engine intake valve engineered for controlled air-fuel charge entry into the combustion chamber. The nitride-coated finish helps the valve withstand heat and mechanical stress in demanding engine environments, while the specified head diameter, stem diameter, and overall length support accurate fitment in the intended Nissan and Suzuki engines. This intake valve is a practical replacement choice for Nissan Frontier, Nissan Altima, Nissan Sentra, and Suzuki Equator models where the original valve dimensions match the listed specifications.

This part cross-references no additional part numbers in the provided data.

Common Problems This Part Can Address

• Worn or recessed intake valve sealing surfaces
• Loss of compression from valve wear or heat damage
• Rough idle caused by intake valve sealing issues
• Reduced engine breathing from damaged valve components
• Valve replacement needs during cylinder head service

Installation Notes and Tips

Verify valve head diameter, stem diameter, overall length, and lock groove count against the removed part before installation. Confirm engine code and cylinder head specifications for your Nissan Frontier, Altima, Sentra, or Suzuki Equator application. Professional cylinder head service practices, including inspection of valve guides and valve seats, help ensure proper sealing and long-term operation.

Quality Assurance

DJ Rock specifies this intake valve as a premium-grade replacement manufactured to meet or exceed OEM quality standards. The nitride-coated construction and heat-resistant material selection are intended to support durability in high-temperature valvetrain service.