From what we have heard, the best way to break in a solid lifter cam is to install a set of fairly WEAK valve springs, and run the engine at about 2,500 rpm for 30 minutes. We didn't want to take a chance on runaway rpm due to vacuum leaks, or washing down the cylinder walls with too rich a mixture, during the break-in process, using a 4 bbl carb that has been heavily modified, as opposed to a 1-bbl carb that is virtually bone stock. We figured the fuel management system in the stock 1 bbl was probably more manageble than the modified 4-bbl.
