It is common practice in engine building to plug the oil drain holes in Small Block Chevrolet engines with standpipes. Usually these are made of pipe and threaded into the holes. COMP Cams® offers a custom extruded aluminum version with an internal hex for installation. It is simple, inexpensive and much easier to use. PartNumber : cca4932 Description : Lifter Valley Standpipe; 8 Pieces Title : 4932 Oil Tubes, Lifter Valley California Proposition 65 : WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov Oils & Oil Filters::Additives