hybridcolo.com - MtnHiPerf, mtnhiperf, Mountain High Performance, Diesel Performance,Cummins big valves, Cummins performance, Duramax big valve,P

Description: Full machine shop services offering performance Diesel upgrades including oversize (big) valves for Dodge Cummins 5.9, 6.7, GM Isuzu Duramax 6.6, Ford Navistar Powerstroke 6.0, 6.4 engines. Upgrades for springs, retainers, pushrods, guides, & seats are all available. Also many gas engine head upgrades available, as well as complete Cryogenic Processing services in house. Diesel racing heads. Diesel porting and flow work.

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