70" 340 vs 72" 340 specs please

The stock flywheel HP for 68-70 was 310/315 range. The '70 Six Pac made 325 and the '71 made 330 actual HP. ' 71 was best year for HP. It had the good compression and the well designed TQ and intake and large vales. The '72 made 295/300 range HP . Only difference between '71 and '72 model was the Pistons were down in the bore .100 as was stated above and the 1.880 intake valves which really made very little difference. The '72 would run just as hard as any of the earlier models, but the '71 was the hottest of the 340 offerings ....even better than the six pac cars. According to NHRA .

Terry