1970amx wroteI would definetely break a new engine in with 15-40 Rotella oil and a good dose of crane additive or GM EOS additive.
After break in I would stick with the same oil unless you want to change over to a good synthetic.
I am not familiar with the Napa oil filter so I can't comment on that. In my race car I use a Fram HP filter. The Fram HP filters are a great filter. Do not use a std Fram filter under an circumstances....they are junk.
in my other post about head gaskets in the engine forum i just repied. comp cam suggested the same thing about the engine and cam break in, 15-w40. i did find some rottela t at the checker store. what do you think about running that stuff after break in or should i switch to 10-w40 or 20-w50 and add the EOS. thanks mikey