LS - 4.125 Bore

Dart Non-Skirted Cast LS Next Iron Block, 9.240" Deck Height X 4.125" Diameter Bore, LS Main, Steel Cap
Part Number: 31837211

Dart SHP Skirted LS Next Pro Cast Iron Bare Block, 9.240" Deck Height X 4.125" Diameter Bore Steel Cap
Part Number: 31867212

*********************MACHINED FOR 55mm ROLLER CAM BEARINGS*********************
Dart Non-Skirted LS Next Aluminum Bare Block, 9.240" Deck Height X 4.125" Diameter Bore, Steel Main Cap
Part Number: 31937211