PRW Billet Main Caps 4-Bolt Splayed Outer — Fits 70-80 Chevy 400

SKU: FMJX_1740002
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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 PRW

PRW engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full PRW lineup with fast shipping and expert fitment support — order with confidence.

Splayed Billet Main Caps for Chevy 400 Small Block

Maximize the strength of your Chevy 400 Small Block engine with PRW Billet Main Caps featuring a splayed outer bolt design. Designed for 1970-1980 engine blocks, these caps provide the ultimate protection against main cap walk and crankshaft deflection. The splayed bolt configuration angles the outer bolts into the thicker, more stable sections of the engine block, significantly increasing the clamping surface and overall bottom-end integrity.

Technical Specifications

  • Application: Small Block Chevy 400
  • Configuration: 4-Bolt Main
  • Bolt Pattern: Splayed Outer Bolts
  • Journal Size: 400 Journal
  • Quantity: Set of 3 (Center Caps)

These billet steel caps are a must-have for high-output engines where standard straight-bolt caps may fail. The precision-machined billet steel offers unmatched durability and thermal stability, ensuring your engine remains reliable under extreme racing conditions. By using splayed bolts, you distribute the stress more evenly across the block, which is critical for the high-displacement Chevy 400. This set is the perfect foundation for any serious performance build, providing the security needed for high-RPM operation and heavy loads. When you need the best in engine block components, look to the selection at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About PRW

PRW engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full PRW lineup with fast shipping and expert fitment support — order with confidence.

Splayed Billet Main Caps for Chevy 400 Small Block

Maximize the strength of your Chevy 400 Small Block engine with PRW Billet Main Caps featuring a splayed outer bolt design. Designed for 1970-1980 engine blocks, these caps provide the ultimate protection against main cap walk and crankshaft deflection. The splayed bolt configuration angles the outer bolts into the thicker, more stable sections of the engine block, significantly increasing the clamping surface and overall bottom-end integrity.

Technical Specifications

  • Application: Small Block Chevy 400
  • Configuration: 4-Bolt Main
  • Bolt Pattern: Splayed Outer Bolts
  • Journal Size: 400 Journal
  • Quantity: Set of 3 (Center Caps)

These billet steel caps are a must-have for high-output engines where standard straight-bolt caps may fail. The precision-machined billet steel offers unmatched durability and thermal stability, ensuring your engine remains reliable under extreme racing conditions. By using splayed bolts, you distribute the stress more evenly across the block, which is critical for the high-displacement Chevy 400. This set is the perfect foundation for any serious performance build, providing the security needed for high-RPM operation and heavy loads. When you need the best in engine block components, look to the selection at GGCRACING.

Product Details

Product Description

About PRW

PRW engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full PRW lineup with fast shipping and expert fitment support — order with confidence.

Splayed Billet Main Caps for Chevy 400 Small Block

Maximize the strength of your Chevy 400 Small Block engine with PRW Billet Main Caps featuring a splayed outer bolt design. Designed for 1970-1980 engine blocks, these caps provide the ultimate protection against main cap walk and crankshaft deflection. The splayed bolt configuration angles the outer bolts into the thicker, more stable sections of the engine block, significantly increasing the clamping surface and overall bottom-end integrity.

Technical Specifications

  • Application: Small Block Chevy 400
  • Configuration: 4-Bolt Main
  • Bolt Pattern: Splayed Outer Bolts
  • Journal Size: 400 Journal
  • Quantity: Set of 3 (Center Caps)

These billet steel caps are a must-have for high-output engines where standard straight-bolt caps may fail. The precision-machined billet steel offers unmatched durability and thermal stability, ensuring your engine remains reliable under extreme racing conditions. By using splayed bolts, you distribute the stress more evenly across the block, which is critical for the high-displacement Chevy 400. This set is the perfect foundation for any serious performance build, providing the security needed for high-RPM operation and heavy loads. When you need the best in engine block components, look to the selection at GGCRACING.

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