Tomei Rocker Arm Stopper - SR20DE/SR20DET (Intake & Exhaust Set)

Protect your SR20 engine from catastrophic valve train failure with the Tomei rocker arm stopper set. This essential upgrade prevents rocker arm walk and lateral movement that can cause severe engine damage in high-RPM applications. The set includes both intake and exhaust rocker arm stoppers for complete protection.

Key Features:

• Prevents rocker arm lateral movement (walk)
• Includes intake and exhaust stoppers (complete set)
• Precision-machined aluminum construction
• Direct bolt-on installation
• Essential for high-RPM and aggressive cam applications
• Prevents catastrophic valve train damage
• Premium Tomei quality and engineering
• Made in Japan

Performance Benefits:

• Prevents Rocker Arm Walk: Eliminates lateral movement that causes damage
• High-RPM Protection: Critical for engines revving beyond stock limits
• Aggressive Cam Compatible: Required for high-lift, high-duration camshafts
• Prevents Engine Damage: Stops rocker arms from contacting valve cover
• Complete Set: Includes both intake and exhaust stoppers
• Direct Fitment: Bolt-on installation using existing mounting points

Specifications:

• Brand: Tomei
• Product: Rocker Arm Stopper Set
• Material: Precision-machined aluminum
• Finish: Anodized
• Quantity: Set of 2 (intake and exhaust)
• Installation: Direct bolt-on
• Made in: Japan

Fitment Information:

• Compatible Engines:
• Nissan SR20DE (naturally aspirated)
• Nissan SR20DET (turbocharged)
• Common Applications:
• Nissan 240SX S13/S14/S15 (SR20DET swap)
• Nissan Silvia S13/S14/S15
• Nissan 180SX
• Nissan Pulsar GTi-R
• Nissan Bluebird SSS
• Note: Required for high-RPM builds and aggressive camshaft applications

What's Included:

• Tomei rocker arm stopper - intake side
• Tomei rocker arm stopper - exhaust side
• Mounting hardware

Installation Notes:

• Professional installation recommended
• Direct bolt-on - no modifications required
• Install during valve cover removal or cylinder head service
• Torque mounting bolts to specification
• Verify rocker arm clearance after installation
• Essential upgrade before installing aggressive camshafts

Why Rocker Arm Stoppers Are Critical:

The SR20 engine's rocker arm design allows lateral movement (walk) under high-RPM operation and aggressive camshaft profiles. This lateral movement can cause the rocker arms to contact the valve cover, leading to catastrophic engine damage including broken rocker arms, damaged valve stems, bent valves, and destroyed valve covers. Tomei rocker arm stoppers prevent this lateral movement by physically constraining the rocker arms, ensuring they stay in their proper position even under extreme conditions.

High-RPM and Aggressive Cam Applications:

Rocker arm stoppers become essential when revving beyond stock RPM limits or running aggressive camshafts with high lift and duration. The increased valve spring pressure and higher RPM operation amplify the forces that cause rocker arm walk. Installing Tomei rocker arm stoppers is mandatory insurance for any serious SR20 performance build.

Precision-Machined Aluminum Construction:

Tomei rocker arm stoppers are precision-machined from high-quality aluminum and feature an anodized finish for durability and corrosion resistance. The stoppers are engineered to provide the exact clearance needed to prevent rocker arm walk while allowing normal valve train operation. The lightweight aluminum construction adds minimal weight to the cylinder head.

Complete Intake and Exhaust Set:

This set includes both intake and exhaust rocker arm stoppers, providing complete protection for your SR20 valve train. Both sides require stoppers to prevent damage, making this complete set the proper solution for protecting your engine investment.

Why Tomei?

Tomei has been manufacturing premium performance parts for Nissan engines for decades. Their rocker arm stoppers are engineered using extensive dyno testing and real-world racing experience. Every Tomei component is manufactured in Japan to the highest quality standards and proven in competition.

Installation Tips:

• Remove valve cover to access rocker arms
• Clean mounting surfaces thoroughly
• Install intake and exhaust stoppers using provided hardware
• Torque mounting bolts to specification
• Verify rocker arm movement is constrained but not binding
• Reinstall valve cover with new gasket
• Check for proper valve train operation after startup

Perfect For:

• High-RPM SR20DE/SR20DET builds
• Engines with aggressive aftermarket camshafts
• Track cars and drift builds requiring reliability
• SR20DET swaps in 240SX, Silvia, 180SX
• Anyone building a serious performance SR20 engine

Perfect For: SR20DE and SR20DET owners building high-RPM engines or installing aggressive camshafts - Tomei rocker arm stoppers prevent catastrophic valve train damage.

Pro Tip: Install rocker arm stoppers BEFORE installing aggressive cams - they're essential insurance against expensive engine damage.

Made in Japan: Premium Tomei quality with precision-machined aluminum construction proven in competition.

Protect your SR20 engine - Tomei rocker arm stoppers, intake and exhaust set, prevents rocker arm walk, high-RPM protection, direct bolt-on, made in Japan.