I heve used them ( Comp Magnum Ultra Pros) on 2 engines recently. Mine has stealth heads and uses them with isky 9315 springs, which are 1.550”. No problems at all and no contact at all. Almost 2 years now and about 2500 street miles and a bunch of runs at the track. Work perfectly with no issues. Recently removed and inspected.
The other engine has Ttricklow 240s, but their hyd roller springs are 1.54”. So no issues their either.