8x1.25 Intake Manifold Bolt for Chevy Gen III LS 3/8 Flanges 4.8 5.3 6.0 6.2L

Product Overview

This M8 x 1.25 intake manifold bolt secures intake manifolds to cylinder heads on Chevy Gen III and LS V8 engines. It features a 3/8" flange for even clamping force, preventing vacuum leaks and ensuring proper manifold alignment. Ideal for engine builders, mechanics, and DIY enthusiasts working on 4.8L, 5.3L, 6.0L, and 6.2L LS engines.

Key Features & Performance

• Precision M8 x 1.25 thread pitch for exact fitment in LS cylinder heads
• 3/8" flange diameter distributes clamping force evenly, preventing manifold warping
• High-strength alloy steel construction resists torque and heat cycling
• Engineered to meet or exceed OEM torque specifications
• Direct replacement for factory bolts on 4.8L, 5.3L, 6.0L, and 6.2L LS engines
• Corrosion-resistant plating for long-lasting durability

Fitment & Compatibility

• Chevrolet Gen III and LS-based V8 engines
• 4.8L (LR4, LY2)
• 5.3L (LM7, L59, L33, LH6, and others)
• 6.0L (LQ4, LQ9, LS2, and others)
• 6.2L (L92, L9H, LS3, and others)
• Designed for 3/8" flange-style intake manifold bolts

Common Uses

• Securing intake manifolds during engine assembly or rebuilds
• Replacing broken or corroded manifold bolts
• Upgrading fasteners for high-performance LS engine builds
• Ensuring leak-free manifold seals on street and race applications
• Restoring factory torque specifications on used engines

Technical Specifications

• Head Style: Flanged hex
• Thread Size: M8 x 1.25
• Flange Diameter: 3/8"
• Compatible Engines: Chevy Gen III/LS 4.8L, 5.3L, 6.0L, 6.2L

Frequently Asked Questions

Q: What torque specification should I use for this manifold bolt? A: Always follow the factory service manual for your specific LS engine; typical values are around 44 inch-pounds plus an additional angle, but variations exist.

Q: Will this bolt fit all Gen III/LS intake manifolds? A: Yes, it is designed for 3/8" flange intake manifolds on 4.8L, 5.3L, 6.0L, and 6.2L engines, but verify your manifold flange size before installation.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.