Reply to "Stroker engine vibration"

Kristian, your shop will likely catch this if the following happened. In the latest issue of Hot Rod Magazine, a man bought an engine from a 'reputable' dealer, and from day 1 it had a vibration. After going thru all the bolt-on things you did, he gave up trying to fix it, but could not drive over 70 mph due to the shaking.
Finally, a shop pulled the engine, tore it down and found a severely lightened crank that had been (apparently) balenced for a different set of pistons and rods. The crank was 93 gms out of balance where 10 grams will cause a noticable shake! The constant shaking had torn up bearings and other things inside, meaning that the entire engine needed a rebuild after the crank rework for the new balance factor. This is one of those things thats impossible to fix externally and very hard to even diagnose. But as someone said, once you've eliminated all the probable causes, what's left are the improbables.... Good luck.