Hum.... This is not lookin as good as it did last night, Well the exact argument was.... going from a 1.5 ratio to 1.6 is the same as changing to a cam with 4* more duration, I said: That is not true, its like going to a more aggressive lobe, Now after reading the new posts I am not too sure of my position, well anyhow I don't know how they came up with exactly 4* more duration The way I see it is cams are measured by tappet lift, seems .050 is common, so no rocker change is going to effect this....But the end result @ the valve will see the change.... May have to go to a vote to see who is buying here Oh one more point... its a bunch of Chevy guys I am debating with, but don't let that influence your opinion