Thanks for that picture. It's the best.

Lovin your powder coating.  Can't wait to hear about your finished project.  What cam are you fixin to run in your engine?

I've toasted a couple of left side main bearings.  Just figured that out.  I think the DR cam might be the reason.  I didn't drill holes in the lobes.  I'm thinkin maybe those holes aren't intended to lubricate the lobes and rockers.  My cam always looks great when I inspect.  So, maybe the holes are intended to spray oil forward to cool the valves and send oil down the forward drain to lube the left-hand main bearing and balancer bearing.

If you haven't already drilled the holes in the lobes, I would do it before you put the engine in the bike.

I know I've previously taken the position that those holes aren't necessary.  I based that on the fact that my lobes & rockers were holding up great.  I didn't see the main bearing issue.  Always something new to learn.

More to come.

I use a cam sprocket and the stock cam to set up the hole location.  I install the sprocket on the stock cam along with drive pin, then lightly tighten the bolts.  Grab the sprocket in a machinists vice and align the stock hole with your drill head.  The drill bit should be parallel with the vertical axis and centered in the stock oil hole.  Adjust the cam sprocket in the vice and the milling table until alignment is correct.  When alignment is correct, lock the vice tight and lock the mill table.

Then I carefully remove the sprocket bolts and switch out the cam.  Don't loosen the vice, keep the sprocket locked in place, just remove the two bolts and leave the sprocket clamped tight in the vice while you remove and replace the cam.  That puts the drill in the exact same location on the DR cam lobe.  Lightly tighten the bolts so as not to disturb the alignment.  

Start with a #1 center drill and finish up with a #47 drill.  I suggest solid carbide tools, but HSS might be OK (never tried it, too chicken).

Repeat the process for the other cam lobe.

The hole in the right-hand end of the cam (in the center of journal) should also be a #47.  The DR cam only has a hole equivalent to a #54 in this location, so you should also drill it with a #47 bit.

So, first set up the stock cam and align drill to existing hole.

Once the holes are drilled, break the sharp edges with a small oil stone.

Thanks for the offer, Dave.  I have a drill/mill in my shop, so it shouldn't be hard to do it.

Woo hoo! Happy to see you’re getting back to this project!

other side

first coat