Made of billet steel, these caps are designed to make use of four 10mm main studs vs the OEM two 8mm bolts, and two 10mm bolts. Tolerances are designed to provide a snug fit in the block, and the crank bore diameter is sized so that material can be machined away to provide a proper fit for your engine. These need to be fitted by a machine shop for proper crank clearance.
This product is currently undergoing testing. Please contact me prior to ordering. Price is still to be determined.