Oil passage cleanup

[gotzoom?]

I decided to get industrious and start working on the 20V head.  I talked with a guy that's going to port, polish and make all the combustion chambers the same capacity and he suggested also cleaning up the rough casting that may impede the oil flow back into the engine.  Judging by the amount of carbon that was crusted up everywhere on the head when I got it, I decided this was a good idea. The flashing around the lifter collars feels better than it looks.  I was worried about weakening the collars, so I chose to grind the flashing so that the oil will roll over it rather than collect on the flat surfaces.  I basically maintained the same angle that the upper part of the collars already have.  Dremel carbide cutting tool good. 

#4 intake area. Before:


#4 intake area.  After:

[extant]

looks like a big difference... or is that just the flash?

[gotzoom?]

I didn't use the same camera and it looks like I didn't do as much as I actually did.  If you look at all the cast edges in the top picture, you'll see all the rough alum left after casting.  I removed most all of it.  The area that I removed is a lighter color than the rest of the head, so it looks like it's still there a little bit, in the lower picture.  I'll take a better pic in the daylight.

[extant]

oh yeah I see it now! I think

[gotzoom?]

OK, here's an area that I'm still working on.  You can see some untouched flashing around the seat for the stud.  On the wall above that, you can see where I removed some of the flashing down to the same level as the rest of the casting.  The difference in color there is where I'm working.