For race use 2-3 is recommended

Inside diameter 10

Used between the tappet cover and the engine case

TC) and 04-up XL come with horizontal mount holes

Hasting Piston Rings BT Evo 1340cc +.010 Packningar Twin Cam For race use 2-3 isStd cyl. bore: 3. 4980" (88. 85 mm). 1st. ring: 1. 6mm. 2nd ring: 1. 6mm. oil ring: 4. 0mm. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3 piece