In "How to Build Horsepower vol1 " by David Vizard he writes "I found that installing 1.6 rockers can (depending on the camshaft) slightly broaden the horsepower curve and add as much as 18hp to a 300hp smallblock.In most case this extra horsepower was obtained solely from increasing the intake lift;adding 1.6 on the exhaust valves results in no further increase.My test engine,equiped with a typical performance street cam and 1.6 intake rockers,did not show any power gain below 3500rpm.From this point upward,however,the addedintake lift improved breathing,and that produced more horsepower-frequently about 5%."
"As the ratio goes up,loads on the rockerarm,rockershaft or studs,valvestems and springs all increase.However,increasing the ratio 0.1(eg.,from 1.5 to 1.6)can usally be accomplished without any adverse side effects."
"This is a great way to gain valve lift without changing camshafts or significantly altering the duration.And,remember,increasing lift often increases both bottom end torque and top end horsepower,particularly if valveliftis under 0.500-inch."
Im gonna do this same thing to my engine Shotgun do you have a link to those rocker arms you are looking at.At one time summit were selling rocker arms in offset ratio (8 1.6 rockerarms and8 1.5 rockerarms)i wanna go that route since i read a few topics were they state even on the exhaust side you wont ever see the benifts of the increased lift only on the intake.
