[Steeveedee]

Under certain conditions, detonation can occur even at part throttle. If one looks at the list of vacuum advance cans available, they have different amounts of advance, and different levels of vacuum required to gain that advance. There are a lot of variables that GM's engineers labored over to make each vehicle work most efficiently. At this point, we're all just guessing unless they have access to a dyno, which is an expensive proposition. Question- which is more expensive- dyno tuning or replacing a piston or crankshaft because of detonation issues?