I was 2000 rpm break ins and that’s when it’ll start to over heat even tho the cam that’s in the Engine was the same cam that was in before the rebuild and what do you mean by breaking speed?
Eliminate the bypass (pump to manifold) during break-in. This ensures ALL of the water makes it to the radiator, and you will be able to complete break-in without interruption.
I run mine that way all of the time.
BTW, Big blocks don't have them.
