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01-16 6.6L Duramax Wagler Billet Main Caps

Strengthen the bottom end in your 2001-2016 GM 6.6L Duramax with the Wagler WCPC6641 Billet Main Caps. Designed, and machined in-house at Wagler Competition Products, these Billet Main Caps increase strength and rigidity and work with or without the WCP Girdle. 


  • WCP Billet Main Caps are designed and machined in house
  • Does not distort when torquing down main studs
  • Adds strength to the bottom end
  • Can be used with or without the WCP Girdle
  • For extra strength add the WCP Street Girdle
  • Made in the USA
  • Must be line bored


Part Number: WCPC6641 

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Tags: , 6.6 , Duramax , Wagler , Billet , Main , Caps