One of the strangest searches I've done, stock rocker ratio's of the 426 Hemi.

Is there some mystery I'm missing to all of this? I had thought it was 1.56 intake 1.53 exhaust (no clue where I got that over the years) but now that I started searching for it, I find practically nothing, other than more modern or A/M rocker ratios.

And also this piece of info from this forum;

"The valvetrain geometry on the 426 Hemi is the most ... ROCKER RATIO The stock Hemi rocker ratios are in the 1.5 to 1.56 area. "

"The ratio of these rockers is same as factory 1.57 / 1.53 . True actual ratio from factory and on these is actually lower. "

Links to info no longer available.

So what's the deal? Were the tolerances in manufacturing so bad that there is no consensus on what the stock ratios are?

Or do those long, thin spider leg rockers, slowly Change ratio over time and when running larger cams ect…………

Reason I'm asking is we just dialed in the Erson 278/370 solid roller cam and with 370 lobe lift plus 1.50 rocker ratio we should be about 555 lift and we are at 525 lift on the intake. (was originally hoping for the 1.56 # which would have been 577!)

Could the rocker ratio be below 1.5?