What material are these cap screws made from?

These cap screws are made from ARP Custom Age 625+ material. This is a high-strength alloy known for its excellent fatigue resistance and ability to maintain clamping force under stress.

What is the main advantage of using ARP Custom Age 625+ material?

ARP Custom Age 625+ offers improved strength and better resistance to stretching compared to standard ARP 2000 fasteners. This makes it a solid choice for performance applications where fasteners are subjected to higher loads and temperatures.

Are these cap screws suitable for all engine builds?

These specific cap screws are designed for Small Block Chevrolet engines and feature a 3/8 inch diameter, commonly used for main bearing caps. Always verify fitment for your specific engine configuration.

Specifications

Brand: Manley Performance
Part #: 42321-4
UPC: 807298017013

Manley Small Block Chevrolet 3/8in ARP Custom Age 625+ Cap Screws (Set of 4)

Name: Manley Small Block Chevrolet 3/8in ARP Custom Age 625+ Cap Screws (Set of 4)
Brand: Manley Performance
SKU: manley-performance-manley-small-block-chevrolet-3-8in-arp-custom-age-625-cap-scr-t14-268442
Price: 241.19 USD
Availability: BackOrder

$241.19

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Performance Small Block Chevrolet 3/8in ARP Custom Age 625+ Cap Screws (Set of 4). These well-built fasteners ensure a strong connection for your engine build.

Key Features

Fits Small Block Chevrolet engines.
Constructed from ARP Custom Age 625+ material for improved strength and fatigue resistance.
Features a 3/8 inch diameter, suitable for main bearing cap applications.
Set includes four cap screws for a complete main cap installation.
Designed for performance engine builds where fastener integrity is critical.

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About this part

Product Details

ARP Custom Age 625+ material is a notable choice for these Manley cap screws, offering superior strength and fatigue resistance compared to standard ARP 2000 fasteners. These are specifically sized for Small Block Chevrolet applications, with a 3/8 inch diameter that’s ideal for securing main bearing caps. When you're building or rebuilding a performance engine, the integrity of critical components like main caps is paramount, and using fasteners that can handle the increased stress is key. This set includes four cap screws, providing the necessary hardware for a complete main cap installation on your SBC.

Manley Performance chose ARP's Custom Age 625+ alloy for its proven reliability under demanding conditions. This material is known for its ability to maintain clamping force and resist stretching, even at elevated temperatures and pressures common in performance V8 engines. The 3/8 inch diameter is a standard size for many SBC main cap applications, ensuring a solid fit. Using these cap screws means you're investing in a well-built component that contributes to the overall durability and performance of your engine build.