Dear Wayne,Had an altered with a bb Chevy at Norwalk,Ohio one Sat.nite.The tach had NO light,i did the burnout and it sounded REAL good,made the run and when i stopped on the return road and was gathering up the chute i looked at the tell tale on the tach.Yea it was at 10,000 that was as high as the tach went WHO knows how hi the motor was???? NEVER missed a beat,good old 427,aluminum rods,titanium valves,GREAT valve springs and a lightened crank BEST engine i ever had,7.43 at 185.YAHOOOOO.diz