If the cam is close to being right it makes
very little change.. on the exhaust side I
havent ever seen a change on a lot of engines..
I tried a rocker change a few times and only on
my W-9 405ci did it change the output(intake rockers)
but that cam was way off..it needed another .150 lift
than what I had but I wimped out thinking I would be
changing springs often
wave