Cast pistons and cast crank at 6700?!? YIKES!
I had a malfunctioning tach cost me a cast piston 327 once. Piston head separated from the skirt, skirt dissolved and the pin put four lovely grooves into the water jacket.
Tach said I was shifting at 6000, (with the engine laying down at 5500, wtf?)
Real shift rpm was high side of 7500. Resulting in OOPS!
I know stroker 4.000 cranks could handle probably 7,000 rpm's but I would think with the Chevrolet small block connecting rods, and those pistons would put my pistons over the deck?