Saker
Senior Member
My understanding is that the 7 groove design is pretty much the only change and it has no impact on total lift available. IOW, instead of four grooves spaced 1/2" apart, they spaced them 1/4" apart (filled in the three gaps between the 1/2" grooves). The issue was that 1/2" was too much of a lift to trim out driver's side lean and people were still needing to use a 1/4" spacer. Now people can just drop the DS one notch (1/4") lower than the PS and avoid having to use a spacer on top. If you did that with the old 1/2" notches you'd end up with lean to the PS.
A 1/4" spacer gives 1/2" correction height on top of the coil assembly.