I dont believe you said what cam this was. What was it? what springs were in it? did you check the installed height of the springs? did the lifters spin easy in the bores? did they slide into the bores with a slight THUMP when they hit the cam? doid you use ZDDP or EOS as a cam lube? Did you break in the cam by running it between 2500 and 3500 for 20 to 30 minutes? what pistons are in it? did you check valve to piston clearance?