Black Diamond Hyper-Finish Diamond Valve Guide Hone

Achieve a Flawless Finish in Half the Time with the New & Improved CNC-Machined Sizing System

Stop juggling dozens of expensive reamers and struggling with inconsistent finishes. The Goodson Black Diamond™ Valve Guide Sizing System is the ultimate solution for professional engine builders seeking speed, versatility, and unmatched precision.

Whether you’re working with cast iron, manganese bronze, or chilled cast, this system delivers a perfect, consistent finish every time. Now manufactured entirely on CNC machines, the Black Diamond system eliminates the quality variations of older hand-made tools, ensuring the tightest tolerances for your high-performance engine builds.

Key Features & Benefits

• Universal Compatibility: The diamond abrasive works across every guide material—from cast iron to manganese bronze—without losing its finish or requiring separate reamer sets.
• Infinitely Adjustable: Each mandrel offers an adjustment range from .010" to .039" depending on the mandrel diameter, allowing you to size more guides with significantly less tooling. Just 11 mandrels can replace up to 72 traditional reamers.
• CNC-Machined Precision: Built for accuracy, our new design eliminates human error in manufacturing, providing better availability and consistent sizing across your entire shop.
• Massive Sizing Range: Size guides from .193" to .389" ( 4.90mm - 9.90mm) simply by switching mandrels.
• Easy to Use: No expensive setting fixtures or specialized adjusting tools are required. The integral witness mark on the knurled adjustment screw allows for confident, on-the-fly adjustments.
• Cooler, Cleaner Operation: When used with Goodson Diamond Honing Oil, the system runs cooler and prevents stone loading, even under high-pressure honing.

Why Choose the Black Diamond System Over Traditional Reamers?

Traditional reaming can be a "hit or miss" process depending on material hardness and tool wear. The Black Diamond Hyper-Finish technology uses electroplated diamond abrasives to "hone" the guide rather than "cut" it. This results in superior oil retention, better valve stem support, and a more durable surface finish that extends the life of the valve train.

What’s Included in the Master Kit (BHF-KIT)

• Precision Drive Head (HF-100)
• 4 Mandrel Assemblies: Covers the most popular sizes (7.00mm, .312", .343", .375")
• 4 Nylon Valve Guide Brushes: For easy cleanup and inspection
• 8 oz. Diamond Honing Oil: Formulated specifically to optimize diamond abrasive life
• Carrying Case: Keeps your precision tools organized and protected

Technical Specifications