there is a difference in the valves. i believe, but am not sure, it's because my motor is a 78. the  end of the valve is different. do you think that the keepers are the sole difference? my valves have a groove around the stem around 3/8" from the end of the stem. the valves i got have a long narrow section, then a wider part at the end of the stem.

You know how many people god kills in the bible? I mean, if you add up all the floods and plagues and fire and brimstone. All the "god smote" this, "god smote" that... you know how many people he kills? Millions. And what about the Devil? The big scary Devil. What do you think his body count comes to? A paltry ten... Kinda raises a big question, don't it? Between Heaven and Hell...which one should we really be afraid of? ----Johnny Blaze