Member "BlueSilver" sent in the following images of a special valve rocker for a DT engine. You will note in comparison to a standard DT valve rocker, the push rod arm is shorter. This has the effect of increasing the ratio and hence valve lift.
What is interesting is that it has the standard part number (8530) in the forging. The question is, factory or modified?
If modified, the work appears to have been done long ago and well executed. Report is upon subsequent cleaning the finish all over is very uniform, with no obvious evidence of a weld material.
The argument against it being factory is a different die would be required, and it would then have a different part number, or no part number.
I believe I can see a few locations of weld undercut, or incomplete fill. Here are some close-up views of the short arm.
If there are more of these out there just like this, then it would be more likely it was something the factory made a batch of. Has anyone seen a similar DT valve rocker with a short push rod arm?
-Doug