Reply to "Piston removal"

Well, in my case the previous owner got in the 80th a new engine installed by Hall Pantera. That engine had an early stroker kit installed (I measured 371 cubic inches). When I overhauled the engine I found the crank counterweights looking like a Swiss cheese (approx 25% of the crank counterweights drilled away). I'm suspecting that they took a crank that was internally balanced and tried matching it with the external balanced Cleveland configuration (Cleveland flywheel and damper) and obviously they were not very successful with that task since engine was vibrating so heavily that I got scared going above 4000 rpm. I found a shop in Germany that balanced the complete rotary assembly (crank, flywheel, clutch housing, damper, belt pulley). I brought them one piston and connecting rod to calculate the bob weights. The shop drilled additional holes in almost all crank counterweights. The improvement is very impressive. 83 grams imbalance make a big difference at high engine revs.
Brgds
Hartwig