Steve,
They are not thicker for the entire length. Essentially, you can bore the guide hole, if needed, and then counterbore the larger diameter hole for the lock ring taking the threads off. The guide is made to fit both diameters. It looks thick, but it is just a standard guide with a flange on top.
That flange on top can be widened so it reaches the walls. Then the guide can be machined out of a large round to include the vertical walls on the outer edge of the flange that will run up to the upper guide much like Norman mentioned. The photo below looks to be two parts rather than one. A guide and a wall.
I think this is a special application that Terry did, but it will certainly keep the guide in place.
Terry has a seal in the guide in this one.
The rocker feed bolt is just a straight in bolt with screw to block off the oil passageway at the top.
David
They are not thicker for the entire length. Essentially, you can bore the guide hole, if needed, and then counterbore the larger diameter hole for the lock ring taking the threads off. The guide is made to fit both diameters. It looks thick, but it is just a standard guide with a flange on top.
That flange on top can be widened so it reaches the walls. Then the guide can be machined out of a large round to include the vertical walls on the outer edge of the flange that will run up to the upper guide much like Norman mentioned. The photo below looks to be two parts rather than one. A guide and a wall.
I think this is a special application that Terry did, but it will certainly keep the guide in place.
Terry has a seal in the guide in this one.
The rocker feed bolt is just a straight in bolt with screw to block off the oil passageway at the top.
David