First All your methods have their good points, but, V one S I beleive what the manufacturer is talking about is bench break-in. (no load). Most manufactures suggest a least 2 - 4 short runs (3 or 4 minutes) on a block with the wheels off the ground. Ammdrew, your break-in sounds right, but for race engines (ABC)you can go up to 260 to 280 degrees. For most beginer engines(ABN) you are correct in that they should run about 220 to 240 degrees with the body on