Eliminate internal oil leaks and sumping issues caused by factory casting imperfections.
As many Twin Cam owners know, the OEM crankcase castings can leave porosity and uneven surfaces around the piston-jet sealing area, allowing internal oil bypass and crankcase pressure loss. This CNC service precisely machines that surface flat and true — permanently correcting the issue and improving oil control and scavenging efficiency.
CNC-machined piston jet sealing surface for true flatness and proper sealing
Corrects internal oil leaks and pressure loss common in factory castings
Increases oiling consistency and reduces sumping tendency
Precision-machined on dedicated Shop67 fixtures for accuracy and repeatability
Result: a fully sealed and properly balanced case that improves crankcase vacuum and long-term reliability.
If you Check yes for the Piston Jet Add Ons you’ll receive S&S Dual Pattern Piston Jets
Note: This is a send-in machining service.
Customer must ship in the right-hand crankcase half, washed and ready for machining, along with a pre-paid return shipping label.
If both cases are sent together or arrive oily/uncleaned, additional cleaning and handling charges will apply.
Eliminate internal oil leaks and sumping issues caused by factory casting imperfections.
As many Twin Cam owners know, the OEM crankcase castings can leave porosity and uneven surfaces around the piston-jet sealing area, allowing internal oil bypass and crankcase pressure loss. This CNC service precisely machines that surface flat and true — permanently correcting the issue and improving oil control and scavenging efficiency.
CNC-machined piston jet sealing surface for true flatness and proper sealing
Corrects internal oil leaks and pressure loss common in factory castings
Increases oiling consistency and reduces sumping tendency
Precision-machined on dedicated Shop67 fixtures for accuracy and repeatability
Result: a fully sealed and properly balanced case that improves crankcase vacuum and long-term reliability.
If you Check yes for the Piston Jet Add Ons you’ll receive S&S Dual Pattern Piston Jets
Note: This is a send-in machining service.
Customer must ship in the right-hand crankcase half, washed and ready for machining, along with a pre-paid return shipping label.
If both cases are sent together or arrive oily/uncleaned, additional cleaning and handling charges will apply.
