2338 Steel breather valve. +.030"

When you are dealing with worn or damaged crankcases, this JIMS oversized steel breather valve is the professional solution for saving the engine cases. Machined to a +.030-inch oversize from aerospace-quality steel, it meets the rigorous CNC standards JIMS is known for. This specific valve fits 1948 to early 1977 Big Twin models. For a proper installation, these early breathers must be used with 1954 to early 1977 style pinion gears and 1970 to early 1977 camshafts. They are also compatible with late 1979 to 1999 style steel breather valve thrust washers. Using the JIMS breather hole reamer tool is highly recommended to ensure a precise fit during the rebuild process.