Educate me on 5.9 Magnum Roller Rockers

Lift is not what you need to be concerned with as far as piston to valve clearance. It's the duration. It's not the how much, but when the valve is open. If you have clearance with the 1.5 you will have clearance with 1.65.

I've been researching this as well. I like the looks of the Hughes the best but man are they expensive! $760. They are 1.65 ratio so I would need to make sure I have enough piston to valve clearance for that. My cam is currently .507/.513 so 1.65 would take that to .523/.530.

I've also looked at Harland Sharpe 1.60 ratio for around $430. Here is a here is a pic of the Hughes set

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