Originally Posted by 3hundred
Originally Posted by 6PakBee
Okay, I am going from memory so take this all with a bag of salt. The standard 440 valve gear was good for about 5800 rpm. Chrysler wanted to raise this to about 6200 rpm. So they installed heavier springs on the Six-Pack motors. Heavier spring...more cam load....a low taper lobe provides more contact area and maintains engine durability with the higher loading. Again, I'm going from memory and I only have two functioning brain cells left.


If yours are gone, mine are too. It was also the rationale for the HD rocker arms which Direct Connection later claimed they'd reinforced the wrong end, FWTW.

From this thread I assume low taper lifters are made of unobtainium? Which would make an NOS 6 pack camshaft a paper weight?



It's no paper weight, just use the crowned lifters with it (new). Break it in normally and use a zinc oil, good to go.

I love the smell of Deer guts in the morning, it smells like... VICTORY!