Proflow OE, Ford Cleveland Block Bypass Restrictor Plate, CNC Machined Brass, Suits 302, 351 Cleveland - PFETH-CBRPPart Number: PFETH CBRP Proflow has remade the now obsolete Cleveland Restrictor Bypass plate which is pressed into the block directly under the thermostat. CNC machined from brass and to the original dimensions It can be easily tapped back into the block to replace the damaged or missing original. Please keep in mind that Clevelands need a dedicated thermostat in order to partially close off the orifice when the thermostat opens, so as to direct the