Engine break in without a tachometer

you don't STICK to any RPM. That's why a tach IS THAT important. You vary engine speed 2500 and above. I usually vary it between 2500 and 4000. The oil splash to the camshaft lobes is what's important. Have your timing light ALREADY hooked up and ready. As soon as it busts off, get the idle about 3000 and put the timing on about 35* at 3000 RPM. This will assure the timing is not retarded. That's probably the number one mistake people make and retarded timing will make a new engine run HOT right off the bat.

There's NO WAY IN HELL I'd try to break one in without a tach. I don't care what some forum gurus say. It's that important.

Do you want to do this all over again?