273 adjustable rockers on 340?

Leadfoot said

If you don't have solid lifters it's all for nothing. If you're including the lifters it'll help. A little.

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Not true. By using the adjustable rockers, he can set the valvetrain for zero lash as opposed to the preload of the stock hydraulic lifters. This completely eliminates any high RPM pump up and you can get a bunch more RPM out of the motor.