Canton Oil Input Sandwich Adapter - Bolt-On - 1/2 in NPT Female Inlet - 1/2 in NPT Female Outlet - Black - Big Block Chevy 23011813 but the degree of accuracy

but the degree of accuracy is dependent upon the tool

4140 steel for increased strength and durability

realtime measurement allows you to know when to downshift or when to take your foot out of it

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Canton Oil Input Sandwich Adapter - Bolt-On - 1/2 in NPT Female Inlet - 1/2 in NPT Female Outlet - Black - Big Block Chevy 23011813 but the degree of accuracyThis BBC Oil Input Adapter and Bypass Eliminator, Mark IV, provide two 1 2" N. P. T. oil input ports, one before filtration (for an external oil pump) and one after filtration (for an Accusump). It mounts between the oil filter and block and bolts into the mounting holes left after the bypass is removed. Removing the stock bypass allows the engine to receive filtered oil all the time. The filter is lowered only 1 1 2". Comes with hardware and O Rings.