These billet steel main caps are the best available for your Mitsubishi 4G63 & 4G64 6-bolt engine. The design incorporates the maximum cross-sectional area for unmatched strength. CNC machined from the best super tough alloy steel for this application, ensuring trouble-free machining, strength, stability, and durability that you would expect from a bullet-proof set of main caps. These will take all the abuse you can throw at them.
This latest design is fully compatible with the Kiggly Racing 6-bolt Main Girdle.
These main caps will require use of ARP main studs, which can be found HERE. In addition, it is required that the block be line-bored & honed with the installation of these billet main caps.