This engine was rebuilt over thirty years ago but had a vibration and was then pulled from the Mustang it was in and covered in a garage. The owner brought it to us to have a refresh and to see what was causing the problem. Well it turns out the crankshaft was out of balance so we corrected the problem and now it is running nice and smooth. This was a stock rebuild and this 428 is pushing a bit over the stock HP of 355 and 445 TQ. It will be reinstalled into the Mustang from which it came.