Mazworx SR20 1/2" Head Stud Kit – SR20DE / SR20DET / SR20VE / SR20VET | High-Boost / Race | #11000

The Mazworx #11000 is the definitive head fastener solution for high-horsepower, high-boost SR20 builds — replacing the factory head studs with 1/2" diameter 8740 chromoly steel studs that deliver over 30% more clamping surface area than the stock fasteners. When cylinder pressure rises with increased boost, aggressive camshafts, or high-compression builds, the factory head studs become the limiting factor between a reliable engine and a blown head gasket. The Mazworx 1/2" kit eliminates that weak link. Developed and race-proven by Mazworx — one of the most respected SR20 specialist engine builders in North America. Important: Installation requires drilling and tapping the SR20 engine block to accept the larger 1/2" fastener diameter. This is a non-reversible machining operation — confirm you are committed to this modification before purchasing.

Why Head Lift Happens — and Why 1/2" Studs Fix It

Under high cylinder pressure, the force trying to lift the cylinder head off the block is enormous. The factory SR20 head studs are sized for the stock engine’s cylinder pressure at stock boost and power levels — adequate for a stock or mildly modified engine, but increasingly marginal as boost climbs. At high boost levels, the factory studs can stretch under repeated thermal and mechanical cycling, reducing clamping force and allowing the head gasket to lift, leak, or fail catastrophically. The consequences range from coolant contamination of the oil to a destroyed engine.

Upgrading to a larger diameter stud is the most effective solution because clamping force scales with the cross-sectional area of the fastener — a 1/2" stud provides over 30% more clamping surface area than the stock stud diameter, delivering significantly higher clamping force at the same torque value and maintaining that clamping force more reliably under the thermal cycling of sustained high-boost operation.

Key Features

• 1/2" Diameter – 30%+ More Clamping Area: The larger 1/2" stud diameter provides over 30% more clamping surface area compared to the factory SR20 head stud diameter — delivering significantly higher head clamping force to resist head lift under extreme cylinder pressure. The most effective head fastener upgrade available for the SR20 platform
• 8740 Chromoly Steel: Manufactured from 8740 chromoly steel — a high-strength alloy with excellent tensile strength, fatigue resistance, and thermal stability under the sustained high-temperature, high-load conditions of race and high-boost street operation. 8740 chromoly is the industry-standard material for high-performance engine fasteners
• Universal SR20 Fitment – All Variants: Compatible with all RWD and FWD SR20 variants — SR20DE, SR20DET, SR20VE (Neo VVL), and SR20VET (Neo VVL Turbo). Fits S13, S14, S15, P10/P11, and all other SR20-equipped chassis. One kit covers the full SR20 engine family
• Race-Proven by Mazworx: Developed and validated by Mazworx — one of North America’s most respected SR20 specialist engine builders, with extensive experience building high-horsepower SR20 engines for drag racing, time attack, and circuit competition. The #11000 is used in Mazworx’s own race engine builds
• Essential for Extreme Builds: The correct choice for any SR20 build targeting serious power levels where head gasket reliability under sustained high-boost operation is non-negotiable — drag racing, road racing, high-boost street builds, and any application where the factory head fasteners are no longer adequate

Fitment

• Nissan SR20DE — All RWD and FWD variants (S13, S14, S15, P10/P11, N15, etc.)
• Nissan SR20DET — All RWD and FWD variants (S13, S14, S15, etc.)
• Nissan SR20VE — Neo VVL naturally aspirated (All variants)
• Nissan SR20VET — Neo VVL turbocharged (All variants)

Specifications

• Brand: Mazworx
• Part Number: 11000
• Stud Diameter: 1/2"
• Material: 8740 Chromoly Steel
• Clamping Area Increase: 30%+ vs factory
• Application: Nissan SR20 (All variants)
• Fitment: Universal SR20 — RWD and FWD

⚠️ Block Machining Required: Installation of the Mazworx 1/2" head stud kit requires drilling and tapping the SR20 engine block to accept the larger 1/2" fastener diameter. This is a non-reversible machining operation that must be performed by a qualified machine shop or engine builder experienced with SR20 block preparation. Do not purchase this kit unless you are committed to this modification and have access to the appropriate machining services. This kit is intended for full engine rebuilds and race engine preparation — not a bolt-on upgrade for an assembled engine.