D&J Precision

D&J Precision Machine is a leader in high-performance diesel engine solutions, specializing in race-ready and street-capable Cummins builds engineered for unmatched power, precision, and reliability. Born from a deep passion for diesel performance, D&J has grown into a trusted name among racers, professional builders, and performance shops across the country. From custom-built short blocks to fully assembled competition engines, every component is crafted in-house using state-of-the-art machining and meticulous attention to detail. What sets D&J apart is their ability to deliver extreme horsepower without sacrificing everyday drivability, helping to balance innovation with proven durability. Their commitment to quality, responsiveness to customer needs, and relentless pursuit of diesel excellence make D&J Precision Machine a go-to source for serious Cummins performance.