ARP Main Cap Side Bolt Kit M8 — Fits Early Ford Modular Cast Iron Block

SKU: ARP156-5201
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About ARP ARP (Automotive Racing Products) makes the strongest fasteners ...Read More

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Sale price$63.99
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About ARP

ARP (Automotive Racing Products) makes the strongest fasteners in motorsport — head studs, main studs, rod bolts, and flexplate bolts used by every Formula 1, NHRA, NASCAR, and championship motorsport program. Aerospace-grade alloys, exact-fit machining.

Watch in action

ARP M8 Main Cap Side Bolt Kit for Early Ford Modular Cast Iron Blocks

When building a high-performance engine using an early Ford Modular cast iron block, the quality of your fasteners is paramount. The ARP M8 Main Cap Side Bolt Kit is designed to provide the ultimate clamping force for your main caps, ensuring stability even under the most demanding conditions. Cast iron blocks are known for their durability, and when paired with ARP's high-tensile 8740 chromoly steel bolts, you create a foundation that can handle significant power increases.

Why Upgrade to ARP?

  • Specifically designed for early cast iron Ford Modular blocks
  • High-strength 8740 chromoly steel construction
  • Consistent clamping force for improved main cap stability
  • Prevents main cap walk and bearing wear
  • Durable black oxide finish

Using stock bolts in a performance engine build can lead to fastener fatigue and potential engine failure. ARP fasteners are manufactured to exceed OEM specifications, providing the reliability required for drag racing, road racing, or high-performance street use. These M8 side bolts are precision-engineered to seat perfectly, ensuring that your main caps remain secure regardless of the torque and vibration generated by your engine. Whether you are performing a full rebuild or a performance upgrade, this kit is an essential component for your bottom end. Trust in the proven performance of ARP hardware to keep your engine running strong. Discover more high-performance engine solutions at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About ARP

ARP (Automotive Racing Products) makes the strongest fasteners in motorsport — head studs, main studs, rod bolts, and flexplate bolts used by every Formula 1, NHRA, NASCAR, and championship motorsport program. Aerospace-grade alloys, exact-fit machining.

Watch in action

ARP M8 Main Cap Side Bolt Kit for Early Ford Modular Cast Iron Blocks

When building a high-performance engine using an early Ford Modular cast iron block, the quality of your fasteners is paramount. The ARP M8 Main Cap Side Bolt Kit is designed to provide the ultimate clamping force for your main caps, ensuring stability even under the most demanding conditions. Cast iron blocks are known for their durability, and when paired with ARP's high-tensile 8740 chromoly steel bolts, you create a foundation that can handle significant power increases.

Why Upgrade to ARP?

  • Specifically designed for early cast iron Ford Modular blocks
  • High-strength 8740 chromoly steel construction
  • Consistent clamping force for improved main cap stability
  • Prevents main cap walk and bearing wear
  • Durable black oxide finish

Using stock bolts in a performance engine build can lead to fastener fatigue and potential engine failure. ARP fasteners are manufactured to exceed OEM specifications, providing the reliability required for drag racing, road racing, or high-performance street use. These M8 side bolts are precision-engineered to seat perfectly, ensuring that your main caps remain secure regardless of the torque and vibration generated by your engine. Whether you are performing a full rebuild or a performance upgrade, this kit is an essential component for your bottom end. Trust in the proven performance of ARP hardware to keep your engine running strong. Discover more high-performance engine solutions at GGCRACING.

Product Details

Product Description

About ARP

ARP (Automotive Racing Products) makes the strongest fasteners in motorsport — head studs, main studs, rod bolts, and flexplate bolts used by every Formula 1, NHRA, NASCAR, and championship motorsport program. Aerospace-grade alloys, exact-fit machining.

Watch in action

ARP M8 Main Cap Side Bolt Kit for Early Ford Modular Cast Iron Blocks

When building a high-performance engine using an early Ford Modular cast iron block, the quality of your fasteners is paramount. The ARP M8 Main Cap Side Bolt Kit is designed to provide the ultimate clamping force for your main caps, ensuring stability even under the most demanding conditions. Cast iron blocks are known for their durability, and when paired with ARP's high-tensile 8740 chromoly steel bolts, you create a foundation that can handle significant power increases.

Why Upgrade to ARP?

  • Specifically designed for early cast iron Ford Modular blocks
  • High-strength 8740 chromoly steel construction
  • Consistent clamping force for improved main cap stability
  • Prevents main cap walk and bearing wear
  • Durable black oxide finish

Using stock bolts in a performance engine build can lead to fastener fatigue and potential engine failure. ARP fasteners are manufactured to exceed OEM specifications, providing the reliability required for drag racing, road racing, or high-performance street use. These M8 side bolts are precision-engineered to seat perfectly, ensuring that your main caps remain secure regardless of the torque and vibration generated by your engine. Whether you are performing a full rebuild or a performance upgrade, this kit is an essential component for your bottom end. Trust in the proven performance of ARP hardware to keep your engine running strong. Discover more high-performance engine solutions at GGCRACING.

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