Hardened shafts and ductile iron rockers ?

[Cranky]

How hard should rocker shafts be for the ductile iron rockers? I ran a combo of Iskys with hard shafts and experienced a bit of galling and wonder if the shafts were a bit too hard? A file won't touch em. Btw, there are different hardness shafts out there....and believe it or not, even stock shafts vary from pretty dog gone soft to much better than that.

 

[wyrmrider]

chrome works better, brass better yet
I'd call rocker arms specialists and ask them
lack of lube?
big springs?

 

[lewtot184]

I've tried stock, chrome, and induction hardened. the induction hardened seems to have been the best but I don't know what the Rockwell was. galling with iron seems to be a nature of the beast and do believe that modern spring pressures/lifts/lobe profiles don't help any. i'd call hughs and see what their banana groove shafts are. i'll guess they're induction hardened, but he may know the Rockwell. I also do a slight hone on the rockers to smooth out irregularities. I like the basics of these rockers but never push them with high lifts and high spring pressures.

 

[wyrmrider]

I've pushed bushed and banana grooved hard chrome shafts with roller cam and .590 lift
also with flat tappet for NASCAR type racing
you have to shim to get the geometry right more so over .500 lift
Deep heat threat trumps electro hardening every time
agree on the hone helps hold the oil