Initial startup cooling system troubles

Exactly. Not enough timing and not enough RPM. Why are people always scared to pull the engine up in RPMS? You need at least 3500 RPM. I always use 3000 as a minimum and vary between 3000 and 4500. You're after splash man. You ain't gettin squat at 2500. Pull some more timing in it and rev it more and let er rip.