Piston Ring Mercruiser→GM Big Block V8

Part # & Price	Description
HAS4718 $109.95	Piston Ring Set GM 7.4 454 cid V8 Shallow Groove Piston Ring Set for GM 454 cid V8 with shallow groove BORE: 4-1/4" COMPRESSION GROOVE(S): 2.0/2.0 mm OIL GROOVE: 4.75 mm Please verify your Ring thickness before ordering. Ring Sets are Non-Returnable. This set includes Piston Rings for all of the Pistons in your engine (1 set per engine) There are two different ring depths used on the 454 7.4 engine. Commonly called shallow Which is .170 and less and deep groove which is .190 and more. These are for the Shallow Groove Pistons!
HAS5518 $124.95	Piston Ring Set, GM 454 High Output Piston Ring Set for GM 454 cid V8 420 HP High Output (HO). BORE: 4-1/4" COMPRESSION GROOVE(S):2.0/2.0 mm OIL GROOVE: 4.75 mm Please verify your Ring thickness before ordering. Ring Sets are Non-Returnable. This set includes Piston Rings for all of the Pistons in your engine (1 set per engine)
HAS683 $50.95	Piston Ring Set GM 7.4 454 cid Big Block V8 Piston Ring Set for a GM 454 c.i.d.(7.4L). BORE:4-1/4" COMPRESSION GROOVE(S): 2.0/2.0 mm (5/64) OIL GROOVE: 4.75 mm (3/16). Please verify your Ring thickness before ordering. Ring Sets are Non-Returnable. This set includes Piston Rings for all of the Pistons in your engine (1 set per engine) There are two different ring depths used on the 454 7.4 engine. Commonly called shallow which is .170 and less and deep groove which is .190 and more. These are for the Deep Groove Pistons!