I found a Comp Cams stainless roller rocker that is made for the Chevy inline six cylinder, (and the four bangers too). Comp Cams Ultra Pro Magnum XD rockers. My little brother, who had some input into the original design, put me on to them.
For the inline Chevy it's a Comp Cams 1827-1. It DOES require changing to 7/16" studs but I'd recommend doing that anyway. !.75:1 ratio and they are available in quantities of one, eight, or sixteen from most speed parts suppliers. I'd bet you can buy them direct from Comp Cams in quantities of twelve as well.
Little brother uses the BBC version in his Super Stock Camaro. It usually turns 8,200 RPM and it's a four speed car.
