440 OEM stamped rocker arm ratio check

[femtnmax]

Checked all 16 stamped rocker arms for the correct ratio; these are 1969 OEM Mopar rockers with 1.5 ratio.  Measured valve lift at the valve spring retainer.

Intake valve lift cam spec:  .478
Measured valve lift ranged from .475 to .480, with average = .477

Exhaust valve lift cam spec:  .486
Measured valve lift ranged from .481 to .486, with average = .483

So all 16 rocker arms are within 99% of the correct ratio.  That's real close IMO.  Maybe I was lucky but good to know they are not way off like some internet sources suggest.

[Kern Dog]

Maybe the stars were in perfect alignment when that set was made!
This year when I switched from the stock type rocker arms to 1.6 aluminum adjustables, the cranking compression numbers all got closer together. I took it to mean that the cylinders were now getting  more even matched valve timing events.

[BSB67]

Maybe the stars were in perfect alignment when that set was made!
This year when I switched from the stock type rocker arms to 1.6 aluminum adjustables, the cranking compression numbers all got closer together. I took it to mean that the cylinders were now getting  more even matched valve timing events.

Unless your rockers are holding the valve off the seat due too long of push rod, it should not effect cranking compression.  Slight differences in rocker ratios will not effect seat timing that would show up in a compression test.

I read more and more often on how the rockers are 1.45, and now people are saying 1.43.  I too have measured them, and I know others that actually measure them as well (verses repeating what someone else has said) and all of the results from those are similar to what OP states.  We have seen the actual ratios in the  1.47 to 1.48 range for the ones we've measured

[Challenger340]

Any I ever measured seemed quite close as well 
IMO,
Some of the lost ratio misconceptions ?... maybe...just "might", have been coming from people checking old worn Camshafts missing lift against published specs ? or lifter bleed down ??

[BSB67]

Any I ever measured seemed quite close as well 
IMO,
Some of the lost ratio misconceptions ?... maybe...just "might", have been coming from people checking old worn Camshafts missing lift against published specs ? or lifter bleed down ??

I know a magazine article is often quoted (has to be right,....right?) as 1.45.  The author (highly respected by some in the Mopar community) does not provide data nor states the source from which the statement is made.  Maybe it was that production lot of rockers, maybe worn out parts, I don't know.  I just have not seen evidence of this with no small amount of actual, well controlled measurements on used rockers. 

[femtnmax]

My test was with a new in box Crower cam, light pressure test springs, and  used rockers/shafts with 80k miles on them.  My test ratio on the exhaust works out to 1.49. 
The rockers are in really nice shape.  The rocker pads that contact the valve stems show no wear at all.