My engine builder has built all my alcohol race engines as well as my Cobra engine. He says pretty much the same thing as Midoasp's guy...warm it up at 2000rpm for 20 minutes and then it's ready to go. I have watched him dyno some of my race engines and he will take them to 7800-8000rpms! His comment was "if it's going to blow it's gonna do it now". I have only blown up one engine and that was due to a thrust bearing failure after several races on this engine. My Cobra engine was warmed up with "light" valve springs, the springs were then repalaced with the ones that I now run. (this is done to ensure no flattening of cam lobes) The engine was then re-started, ran at 2000rpm for about 20mins. then it was straight to 6500rpm. I have nearly 6000 miles on this motor and it gets ran hard at times. I change the
oil every 1500 miles and use full-syn 0-40w European Formula Mobil One along with a K&N
oil filter. Hope this helps