Absolutely not true! Don't know where you've heard this but the comp 8043 lifters don't move the pushrod enough to need work to the head. It may be the head needs the work, because of rocker ratio or poor design (W2's for instance). I used these lifters in our 620HP small block build in CarCraft with edelbrock heads and used 11/32 Manton pushrods and 1.65 TD rockers and I had to grind the pushrod hole slightly at the top and bottom. Most guys don't run that much ratio or this setup so I highly doubt the lifter caused any of this.
Now the hyd. roller lifters out there will cause more problems...but you won't find a better lifter for the $$$ than the 8043.
Brian
