340 rocker arms

AJ/FormS said

If you don't already have arms, then it's only a few bucks more for quality aftermarket arms and you get to upgrade to 1.6 ratio units, which, after installation,might actually be closer to 1.6, compared to the stockers being closer to 1.42. And that means over 12% more lift or ~.057 on an advertised .450 lift cam.

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Be careful with this information above... I've measured out the stock rockers by themselves at 1.48-1.49. People get the lower numbers of 1.44-ish when the measure from lifter to valve.. .but that includes the pushrod angle loss, so is not just the rocker.

That same pushrod angle loss will occur with all of these rockers... so that 1.6 will now be 1.54-ish. Plus a roller will have losses that the stamped rocker does not have, at the roller end. So now you are back down in a 1.52-ish range range for that 1.6 roller. So you're at 6% more lift + or -, not 12% more... but right where you wold expect to be.