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Automotive fasteners engineered for sealing valve covers, aimed at dependable performance under engine conditions. Confident fit and finish help reduce oil leaks and keep maintenance straightforward. Are ARP Hex Style Valve Cover Bolts the right choice for your cast aluminium cover application?
⚡ At a Glance
- • Material Strength: Chrome moly steel construction with black oxide finish for durability and corrosion resistance
- • Best for: Owners fitting or replacing bolts on select cast aluminium valve covers
- • Not ideal for: Applications requiring stainless steel fasteners or high-corrosion marine environments
Manufactured from black oxide finished chrome moly steel, the set includes 14 hex-head bolts with premium washers. Bolts are size 1/4-20 with an under-head length of .812, intended for select cast aluminium covers.
Consistent Valve-Cover Clamping - with 1/4-20 thread and .812 under-head length
Thread size 1/4-20 and the specified .812 under-head length ensure predictable engagement depth and clamp distribution across the cover flange. Hex head geometry allows standard torque tools to apply repeatable preload.
Even clamp force reduces the chance of oil seepage and makes gasket seating more reliable during reassembly.
Robust Corrosion Resistance - thanks to chrome moly steel with black oxide finish
Chrome moly alloy provides high tensile strength, while the black oxide finish adds a surface layer that resists light corrosion and reduces glare. Surface treatment also helps thread lubrication during installation.
Strong, treated steel gives long-lasting use in typical engine bay conditions, protecting threads and appearance over time.
Complete Fitment Package - with premium-quality washers and hex-style heads
Set includes 14 bolts paired with washers selected to sit under the hex head, spreading load and protecting mating surfaces. Traditional hex heads work with common sockets and spanners for straightforward installation.
Fast, repeatable fitting and reduced risk of damage to covers during tightening make maintenance quicker and less error-prone.
✨ The 4 Key Reasons for ARP Hex Style Valve Cover Bolts
- Hex Head Design - Enables use of standard sockets for stable, accurate torque application
- Included Premium Washers - Distributes load, preventing flange deformation and seal failure
- Chrome Moly Construction - Offers higher tensile strength than mild steel, resisting stretching under torque
- Black Oxide Finish - Lowers surface corrosion and reduces light reflection during engine work
📋 Technical Details at a Glance
- Category: Automotive fasteners
- Thread Size: 1/4-20
- Under-Head Length: .812
- Quantity: Set of 14 bolts
- Head Style: Traditional hex head
❓ Frequently Asked Questions
Q: Are these bolts compatible with aluminium valve covers?
A: They are listed for use with select cast aluminium covers, compatibility depends on correct thread size and under-head length matching the cover's specifications.
Q: What size and thread do the bolts use?
A: Bolts are size 1/4-20 with an under-head length of .812, as specified in the product description.
Q: Do the bolts come with washers?
A: Yes, the set of 14 bolts includes premium-quality washers, one for each bolt.
🏆 Our Verdict
Mechanically minded owners and workshops replacing or upgrading valve-cover fasteners will find these bolts well suited to cast aluminium cover applications. Strong chrome moly construction combined with a black oxide finish and matched washers makes for a durable, serviceable fastener set. Consider fitment compatibility before purchase, as correct thread size and under-head length are essential for reliable long-term sealing.
