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While we had the valve covers off, we opted to install a set of Comp Cams roller rockers with 1.6:1 ratio, rather than the stock 1.5:1 ratio. This will increase the valve lift and hopefully add a little more power. With late-model, small-block Chevy engines, self-guided rockers are required. The Comp rollers we're using (PN 1318-16) have the required guides that straddle the valve-tip roller.