Improper engine break in.

Break it in like you're going to drive it! If he's going to beat on it, then beat on it all the time!!

Read a story some time ago....Greg Rager bought his 69 Roadrunner 4 speed, took it off the lot, immedietly changed to Wolfs Head oil and set out for about a 200 mile trip! He was told by some knowledgable builder of Mopars to get it up to speed, then drop it in 3rd and maintain that speed and watch the temp guage climb! When it tops out and starts to come back down, that is the point that the motor is broken in! Arrived at his destination and immedietly went to the track! Strong runner still to this day!! Geof