I`ve dynoed all my motors for the last 20 years I wouldn`t have it any other way. I eliminates a lot of guess work and break in before putting the motor in the car. I literally take the motor off the dyno put it in the car and go racing. Because I`ve been using the same engine builder for so many years he has the records of all my builds and dyno pulls. Its cool to try different things and see HP / Torque gains. Example: found a 12 hp gain going from a Strip Dominator to a Victor intake, my small motor liked the 1 7/8 headers I use with my bigger motor over set of 1 5/8 headers, the Super Sucker carb spacer was worth a few hp, my combo didn`t find any gain going from a 750 to a 950 carb. My friend/ mentor works at the shop I use he`s been a Mopar builder/racer for many more years than I`ve even been racing which is 25, he assembles my motors and dynos them and builds my 904s for me on the side.