Doing race engine stuff on a street engine without a clear understanding of the physics involved and what part of the RPM range the changes come into play usually ends up being an expensive and usually disappointing situation. The dramatically shortened engine life is also very seldom taken into account. On the dirt track cars, an engine needed to be "freshened up" about mid-season, if it didn't hand grenade before that time. Back in the late 1970s we ran two or three engines in a 4 month season, at a cost of $10K to $12K each. The cost these days would be considerably higher! I learned pretty quickly that it's a lot more fun going racing when I'm spending some other guy's money!
Jerry
