Stef’s stainless steel thread in Oil Restrictors with inverted hex are a necessity for late Bowtie blocks, Rocket Olds, Darts, 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. Parts #7225 includes 3 restrictors for use with the Rocket Olds. Never use with hydraulic type lifters.
|2 X Oil Restrictors-Stainless Steel – 1/4″ NPT Invert Hex|
|3 X Oil Restrictors-Stainless Steel – 1/4″ NPT Invert Hex|