Manley Performance · New
Manley Small Block Chevrolet 3/8in ARP Custom Age 625+ Cap Screws (Set of 4)
MPN 42321-4 · Store SKU man42321-4
Supplier stock checked 11/7/2026, 8:06:45 AM UTC. Adding a part does not reserve it.
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Product details
Important excerpt from the ARP catalog regarding proper fastener installation: “The importance of tightening fasteners to their required preload cannot be emphasized enough. If a fastener is not preload cannot be emphasized enough. If a fastener is not tightened properly, the fastener will not apply the required preload on the application it is being used for and may become susceptible to failure. Conversely, if a fastener is over tightened and stretched too much, it becomes susceptible to failure by exceeding it’s maximum yield point.” Manley Connecting Rod Bolt-3/8 ARP CUSTOM AGE 625+ 1.600 UHL ARP625+
Manufacturer fitment & guides
Check 42321-4 against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
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