You just found us!
Your Diesel Deserves The Best.
cummins intake removal, cummins performance, cummins big valve, cummins 5.9, cummins 6.7, cummins oversize valves, cummins racing valves, cummins high performance, mountain high performance cummins cylinder head, fire rings, o rings, msl gasket surface, duramax oversize valves, duramax racing heads, oversize diesel valves, oversize valves for diesels, duramax big valve heads, duramax racing valves, 6.0 or 6.4 powerstroke big valves, 6.0 or 6.4 powerstroke oversize valves, 6.0 or 6.4 powerstroke racing valves diesel performance, big valve performance heads, oversize valve diesel heads, oversize valve performance diesel heads, modified diesel cylinder heads, big valves, duramax racing, 6.0 or 6.4 powerstroke racing heads, cummins racing heads, cummins 5.9 and 6.7 oversize valves, cummins intake manifold removal,
Mountain High Performance (MtnHiPerf, MHP) is your "Go To" Diesel Performance Machine shop, able to help with any of your light duty performance or stock diesel engine needs.  We offer  MHP Performance Push Rods, Valve Springs, Oversize Stainless Steel valves,  CNC and hand Custom Porting,  Pressure Testing, Resurfacing operations, CNC Fire Ring Groove machining, "O" ring groove machining, Boring, Honing, Custom Sleeving, Connecting Rod resizing, Pin Bushing replacement and sizing, Crankshaft work, Balancing, and much more for your Cummins, Duramax, and Ford Powerstroke diesels.  We also can supply most of the engine parts  you might need, to allow us to be your one stop engine shop.  Family owned and operated, with over 70 total years of experience, we can inspect, assess, advise & repair or upgrade your engine.  We also offer Cryogenic Processing Services to enhance the performance and durability of your diesel or gas engine components.  Call us at 303-420-6218 or 303-420-2796 anytime.  We will speak to you directly Monday thru Friday, 8-5 Mountain Time Zone, or leave a message and we will call you back.  E-Mail us at MtnHiPerf@att.net  and we will respond quickly.   We are located in Arvada, Colorado, at 5293 Ward Road, Unit #3, 80002.   Demand the best!  Mountain High Performance.
Double click here to edit this text.

2024 is our 45th year of    continuous operation          under the same                    ownership.