[69cruiser]

Mine are Crane full roller rockers, and the poly locks are flush with the top of the adjusting nut, however my dads race car has comp cams full roller rockers and the poly locks on those stick up about 1/8" above the top of the adjusting nut. so it would appear to be dependant on what brand you have.

Crane cams poly locks have a flat bottom that seats on the top of the stud where as the comp cams poly locks have a slightly tapered bottom causing them to sit a little higher up then crane poly locks.

As far as summit goes, i'm assuming they are using flat bottomed poly locks, in which case, it is normal for them to sit flush or slightly under the the top of the adjusting nut.

Cory