LA’ing a Magnum

67Dart273 said
One thing I don't like about rollers is the lifters are gigantic and HEAVY. That has to make a difference

Isn't the deck height/ etc different? How does that affect your compression ratio? I know you put mag (EQ) heads on an LA you gain a bit

Roller size; I pick up what you’re putting down
Compression; Isn’t that primarily from chamber differences?