ARP 3/8" Hex Starter Bolts for Chevrolet — 4.450" Long Polished Stainless, Pair

These are genuine ARP 4303507 polished stainless 3/8" hex starter bolts — a matched pair designed to replace or upgrade the factory starter fasteners on compatible Chevrolet engines.

If you need reliable starter mounting hardware that resists corrosion and provides consistent clamp-up, the ARP 4303507 kit delivers two long 4.450-inch hex-head bolts engineered to meet automotive tolerances. Manufactured by ARP (Automotive Racing Products), these stainless starter bolts are a direct-fit option for many Chevrolet applications and make an ideal service replacement or upgrade when accessibility and long-term durability matter.

Will these bolts fit my Chevrolet starter?

These bolts are specified as 3/8" hex starter bolts, 4.450 inches in length, and supplied as a pair for GM starters. They are intended to replace the factory bolts in compatible Chevrolet starters but always confirm part compatibility with your vehicle year and starter model before ordering.

• Thread size: 3/8" (standard hex head configuration).
• Length: 4.450 inches — suitable for deeper starter housings.
• Finish: polished stainless for corrosion resistance and clean appearance.
• Pack: sold as a pair, part number 4303507 for cross-reference.

How does the ARP stainless construction help over stock bolts?

Stainless steel resists rust and surface degradation, which is especially helpful where moisture and road salts are present. The polished finish reduces galling and helps preserve threads, offering longer service life compared with many plain steel replacements.

• Corrosion resistance keeps threads serviceable when exposed to humidity or salt.
• Polished surface reduces the chance of seizing and eases removal.
• Stiffer material tolerance improves clamp integrity under load cycles.

What tools and torque considerations should I use?

Use a properly sized hex socket or wrench to avoid rounding the head; ARP fasteners are typically tightened to manufacturer-recommended torque values. If replacing factory hardware, follow the starter and vehicle service manual torque specs to ensure correct clamp and to prevent distortion of mating surfaces.

• Tool: 3/8" hex socket or matching hex wrench for secure engagement.
• Torque: follow vehicle/starter manual — use a calibrated torque wrench for accuracy.
• Installation tip: thread lubricant or anti-seize only if specified by ARP or the vehicle manual.

What comes in the package and what are the physical specs?

This listing is for a brand new, genuine ARP MPN 4303507 starter bolt pair packaged for retail. The bolts are polished stainless steel, hex head style, and sized to serve GM starter applications requiring 4.450-inch length fasteners.

• Contents: two (2) starter bolts — sold as a pair.
• Part number: 4303507 (ARP genuine OEM number).
• Package weight: approximately 0.35 pounds; dimensions: 23.876 x 2.032 x 14.732 cm.

Who is this for: This ARP starter bolt kit is ideal for Chevrolet owners, mechanics, and restorers who want a durable, corrosion-resistant replacement for worn or corroded starter bolts. It's also a good choice for performance-minded technicians who prefer precision-made fasteners with a polished appearance for engine-bay presentation. If you need a direct-fit, long-length 3/8" hex starter bolt with proven build quality, this ARP pair is engineered for that purpose.