Stef's stainless thread in Oil Restrictors with inverted hex are a necessity for late Bowtie blocks, Rocket Olds, Merlins, and BBC because they install flush with the back of the block. These restrictors reduce the lifter/rocket arm oil supply to a .060" diameter hole and cuts oil volume by more than 70%, diverting it to where it is needed most - the main and rod bearings. These restrictors are intended for use with rollerized rocker arm assemblies and solid, roller or mushroom lifter combos. Includes 3 restrictors for use with the Rocket Olds. never use with hydraulic type lifters. Oil Restrictions - Stainless Steel - 1/4" NPT Invert Hex.
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