ARP Starter Bolt Kit 10mm x 4.470in Stainless Steel — 12-Point Head, Direct-Fit

ARP 430-3511 is a high-quality stainless steel starter bolt kit—12-point 10mm bolts with 4.470" underhead length—engineered to replace OEM fasteners with durable, corrosion-resistant hardware.

When you're rebuilding, repairing, or upgrading an engine, the small details matter. ARP's 430-3511 starter bolt kit provides the exact stainless-steel fasteners used to secure starters and related components, offering a direct-fit replacement with race-proven materials. This kit is part of ARP's broad catalog of engine and driveline fasteners, designed to meet the demands of street cars, track builds, and professional motorsport applications.

What makes these starter bolts different from standard hardware?

ARP selects materials and manufacturing tolerances specifically for high-stress automotive applications. These starter bolts are stainless steel for superior corrosion resistance compared with typical plated steel bolts, and the 12-point head geometry helps with access in tight engine bays.

• Material: stainless steel for rust resistance and longevity
• Head type: 12-point design for compact tool access
• Size specifics: 10mm thread with 4.470" underhead length
• Made in the United States to ARP quality standards

How do I know these bolts will fit my starter installation?

Fitment is determined by thread size and underhead length; the ARP 430-3511 is specified as 10mm thread with 4.470" underhead length to match many OEM starter mounting requirements. Always verify the bolt length and thread form against your starter flange and engine block measurements before ordering to ensure proper engagement and clearance.

• Verify 10mm thread pitch and diameter against existing bolts
• Measure needed underhead length—4.470" provides deeper reach
• Check starter flange thickness and any spacers used in your setup
• Contact ARP or your parts supplier for vehicle-specific guidance if unsure

Why choose stainless steel bolts for starter mounting?

Stainless steel reduces the risk of surface corrosion in engine bays exposed to moisture, road salt, and temperature cycles. While stainless may have different strength characteristics than alloy steel, ARP designs these fasteners to balance corrosion resistance with reliable clamp and shear performance for starter applications.

• Corrosion resistance extends service life and eases removal later
• Appearance stays cleaner under the hood for longer
• ARP machining standards ensure consistent fit and finish
• Suitable for street and many light-duty performance uses

How should I install ARP starter bolts for best results?

Proper installation starts with clean threads, correct torque, and any recommended thread lubricant or anti-seize. Follow your vehicle or ARP torque specifications—over-torquing can damage components, under-torquing risks loosening—so use a calibrated torque wrench and tighten in the recommended sequence.

• Clean mating threads on the block and starter flange
• Use the torque spec provided by ARP or vehicle manufacturer
• Apply a suitable thread lubricant if specified—do not guess torque values
• Inspect after initial run-in and retorque if required by service bulletin

Who is this for? The ARP 430-3511 starter bolt kit is intended for mechanics, restorers, and performance builders who need dependable, corrosion-resistant fasteners to secure starters and related components. It's a practical upgrade for enthusiasts replacing worn OEM hardware, for shops performing engine reinstallations, and for anyone who prefers purpose-built fasteners from a recognized manufacturer. Because these bolts are stainless and designed to ARP's tolerances, they suit street cars, project vehicles, and many light performance builds—but always confirm size and torque requirements for your specific application before installation.

Product details:

• Material: Stainless Steel
• Head: 12-point
• Thread size: 10mm
• Underhead length: 4.470 inches
• Package dimensions: 24.1 x 1.9 x 14.6 cm
• Package weight: 0.181 kg
• Country of origin: United States