Product Description Specifications Precision machined from chromemoly steel then black oxided, this 7 degree retainer is designed specifically for 3/8" valve engines with a 1.437"-1.500" outer diameter valve spring like our 984, 990, 972, 901, 988 and 950 springs. Category: Engine Components>Valve Springs, Retainers Core: N LTL: N MPN: 744-1 Proposition 65: Y Special Order: Y