I have been looking at 350 crate engines with hydraulic flat tappet cams. I found the GM Performance Start-up and Break-in Procedures on Jegs and Scoggin-Dickey website. Here is a link. https://sdparts.com/attachment/33742...%20In%20V2.pdf
There are 13 instructions, but no mention of cam and lifter break-in.
Does GM have some way of breaking in cams and lifters on the assembly line? Or are you going to be in trouble for using GM's own instructions?