Hastings, 3-5/8" bore chr/moly piston rings. +.030"

Shovel 3-5/8" big bore

Used with 3-5/8" big bore pistons that use .078" (2.0mm) compression and 3/16" (.186") (4.75mm) oil rings. Std cyl. bore: 3.625" (92.075mm). 1st ring: 2.0mm. 2nd ring: 2.0mm. oil ring: 4.75mm. Note: When 3-5/8" S&S pistons are used you should, in practically all cases, use the Hastings rings for S&S pistons that are mentioned as 'S&S 3-5/8 Big Bore'. These come with 1.6mm compression rings and 4.0mm oil rings. Check before you order. 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 flex vent type. Ring heights are listed for reference. Tech tip: Piston oversizes. For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference. (Tech tip information provided by Hastings Manufacturing Company, Inc.)