MANLEY 11397 8 Exhaust Valve Kit Severe Duty Series (1.625" Head Dia., 5.540" O A Length, 0.3110" Stem) for CHEVROLET Small Block ymm_43 Description HAWK HB531G ymm_28 Description HAWK HB531G Supports 150 250 HP applications When valves bounce on the seat Manley Severe Duty Valves are designed for high performance and racing applications
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