Thanks for replies...
My SR open is 980'ish....guess that answers my question??
I gather the lobe profiles will be different so maybe pressures will be different too as related to lift and ramp speeds..??
Anyone using Johnson lifers??
Just wondering..
P-Dude ...ya out there??
__________________
ECM member.
2008 Outlaw Pontiac Drag Series Champion
MANDRA
Do it now fool! Life is short.
69 Grand Prix/3163lbs / IAII 535 w/ Tiger heads by Gaydosh....9.35@ 144 so far..

through mufflers. 1.26 60'.
Going back to track with pump gas engine....
My 60 Ventura retired to street/strip duty..