Kaneman

iTrader: (5)

I currently have Comp 918 springs and Yellow Terra rockers. Everything is clearanced but it is still pretty noisy my car sounds like a diesel truck. I have a Turbo 408 so I want some good rockers to handle 700-800 rwhp. Does a quieter setup exist?

Kane

PREDATOR-Z

I would swap the 918's and the Terras for Crane dual springs and rockers (1.72s).
you'll need more spring pressure to keep those valves closed with boost.

Kaneman

iTrader: (5)

Do the Cranes fit under the stock valve covers? Is this setup quiet?

Kane

PREDATOR-Z

Yeap and they are the quietest i've ever heard.
They are variable lift so you will benefit from lower rpm trq increase (beneficial for boost).
They are not cheap however, $650 for rockers and p-rods and then the springs are extra.