A Moroso oil restrictor kit for Ford 351C blocks, supplied as a five-pack. The listing specifically notes these are not for use with hydraulic lifters. These restrictors give engine builders a simple means to control internal oil flow and adjust pressure for particular valvetrain or pump setups. Offered as multiple pieces for engines requiring several metering points.
Moroso Ford 351C Block (Not For Use w/Hydraulic Lifters) Oil Restrictor Kit - 5 Pack