When I had my engine on the dyno over six years ago it cost $400, the best money I spent on the entire build. My engine was built to run on pump 93. We broke it in and tuned it on leaded 98 race gas, then switched fuel to the 93, it made 30 more hp on the first pull with no tuning. We cooled it off and made another pull, with the same results.
The bottom line a dyno is a tool, just like a tire pressure gauge or a flow bench. I get a laugh out of guys who claim dyno numbers serve no purpose but swear by their head flow numbers and never see the irony.
