Originally Posted by CompetitionHeat

It has nothing to do with heat treating the material. It's about making sure your engine is 100% ready when you hit the track. We all know what happens when we heat the engine, the material expands and when cooled it contracts. The reason for doing this before starting and running the engine is to nut and bolt it (term for making sure everything is tight) after expansion and contraction. It's just another precautionary step to make sure your not going to have problems down the road, especially with the carb. I would heat cycle a few times before sealing it.

By no means are we saying this is required. Most are going to do as they want to. It's just a recommendation that certainly can't hurt and may save you from a few headaches in the future.