I allways use a strait wieght oil for brake in because of what is in a multi wieght is not good with high heat,like where the rings run on a fresh hone. 30w warmed a little is before the first start is good.If it's a flat tappet cam a racing oil should be used.That what works for me.Bill
I don't know what the tolerances are for the mains and rod bearings, but I can find out seeing as how the engine isn't totally assembled yet. Is there any guide lines I could use? Thanks.
Brad Penn makes a Brake in Oil.It has Loads of the GOODIES that a Fresh Motor NEEDS!!!
Later
G 8)
x2
Penn Grade 1 for break in at $6/qt and like BBChevy said it's got lots of "zippitydodaday" in it. Only 30 wt but breaking in a flat tappet cam you won't be under 2000 rpm anyway.
If possible, run reduced ratio lifters or remove inner valve springs during break in. This is one of my personal streadfast rules.
Good luck, Dave