Custom-Built, Built in-house at JR’s Garage LLC our Duramax diesel engine builds are crafted for performance, towing, or racing. Every engine is precision-assembled, tested, and tuned to meet your exact needs. No shortcuts, no guesswork just proven power.
• Custom-built Duramax diesel engines • Built for performance, towing, or racing applications • Assembled and tested in-house at JR’s Garage LLC • High-performance internals and precision machining • Built-to-order — contact us for custom options and lead times
