See more: Tappets
B. Fits 4 Speed Evolution Sportster 1986-1990, must use adjustable pushrods (OEM 18523-86), Big Axle standard (outside diameter is .8425")
Jims' American made solid tappet assemblies are made from aircraft quality American steel, precision machined, heat treated and ground to less than .0002" total indicator readings at a 16 finish. Available in standard or .005" oversize. The Big Axle tappets feature extra thick tappet rollers that have increased strength and won't deform when used in combination with High Lift Performance cams.