Question on BBC Rocker Ratio

[Marv D]

I sincerely doubt he will ever feel or hear any difference. Adding .1 to the rocker ratio does increase his gross valve lift to .535 / .545,, which means that if the valve is opening further, it has to be open longer at all incremental lifts (.1, .2 etc) but... it does NOT change total duration. It will STILL be the same 'seat to seat' timing will NOT change. Remember 0.050" is the TAPPET LIFT, has nothing to do with rocker ratios or valve lift.

Now the question is,,, that 262 / 268 has to be seat to seat???? Even a duration gobbeling big block is going to thump and bump HUGE if that were 0.050" timing. That's solid roller race cam territory if it were 0.050"

Without knowing the ramps (which are going to be pretty mild with a mild hydraulic like this) he is going to increase the 'typical' 0.050" duration about 1-3 degrees. Which I'll be a dollar to a donut the only thing he notices is that his wallet is lighter. (that is assuming his valve springs and valve to piston clearance doesn't lighten that wallet a lot more)