Pro-Gram Engineering billet main caps are a direct replacement for the factory cast steel main caps. The perfect addition for high horsepower and high boost builds. Made from American made steel that is 3 times stronger than factory the cast iron. CNC machined to ensure highest quality possible. Line bore and hone is required for fitment.
Pro-Gram Engineering has had the pleasure of serving the automotive community for over 30 years and is proud to claim the title of the world’s largest and best manufacturer of aftermarket main bearing caps.