About The Black Mountain Precision Company

The Black Mountain Precision product line includes Billet Cog Belt Pulley kits for both Small Block and Big Block Chevy engines. The kits are designed for Chevy engines with either short or long water pumps and come in a 1” or 2” wide belt system.

Black Mountain Precision, formally Billet Racing Products, is a high performance CNC machine shop that has specialized in the design and fabrication of custom racing and hotrod parts since 1993. Located in Montague, California, Black Mountain Precision is a family owned business utilizing state-of-the-art HAAS machines.

Some years ago, I found the need to design a better pulley system to run the alternator and water pump on my 1966 Big Block Chevelle. After installing high performance parts into the Chevelles’ 427 engine, the motor revved to 7800 so quickly it caused the stock V-belts to fly off every time.

After designing several pulley prototypes, I found that using a HTB 8MM pitch Cog Belt Pulley System kept the belt on perfectly. I then designed and fabricated a 1” wide Cog Belt Pulley System for my 1966 Chevelle. 12,000 miles back and forth to work and a few passes at the local drag strip later, I took the Billet Cog Belt Pulley System off of my Chevelle’s 427 Chevy engine to check for wear and found the Cog Belt Pulley System to be in great condition.

All shipping charges are quoted for the 48 United States. Canada, Hawaii and Alaska will be more. Please contact us for the additional fees before ordering!