Had my 340 that I had stroked and bored to a 418 on the dyno Friday. I was a little disappointed with the numbers till he told that his dyno is 10% off. He has done other motors that have been on a other dyno and his is always 10% low. Using 10% on the dyno sheet the numbers come in what Hughes engines said it would make. 549 torgue 531 hp this was with 91 octane and a rev-n-nator box.