I am building a 350 usign the basic GM Crate 350 (250HP model) I am doing a few things to it to increase performance, but don't want to void the warranty. One thing I am considering is installing roller rockers. Per Four Wheeler or 4WOR (don't remember which), that is a simple way to gain some efficiency from the engine (makes sense to me). The specs for the engine say: Valves: 1.940” / 1.600”. Does that mean the the ratio for the rockers is 1.6? The article also said that you could "trick" your engine into thinking you had a bigger cam by installing rockers with a greater ratio. I can't change the cam as it will void the warranty, so this seems to be a good compromise. What ratio should I go with? Should I just stay at the same ratio and live with it? Will I need taller valve covers? Will this swap force me to do something with the valve springs, pushrods, or anything else as well? Y'all's help is GREATLY appreciated. Brian Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!