Just like all our other products, we're trying to manufacture new alternatives that are cost effective to save you the time it takes to make or hunt for on your own.
Oil supply is critical to an FE, and another way to keep oil to the bottom end is to restrict the top end. These .090" hole restrictors allow enough oil thru to supply rockers but keep the rest going to the crank. No modifications needed, just remove your existing rockershafts and drop these into the galley, that's it. Check out the before and after photos. This is for one kit containing two restrictors, enough for one FE engine with 5/16" oil galley, (352, 360, 390, 427, 428, etc). Does not fit Edelbrock or some 427's.