That Ball peen hammer has sentimental attachment for me....
Anyway not that it isn't fairly obvious, the object is to get the freeze plugs flat enough so you get them to be a tight fit in the large CCV holes in the late model I/H's. These are 91 I/H's.
I used the flat bar & my mini-anvil to take some of the dish out of the plug. You play it by ear, if you go too far I used the ball hammer to reform the cup.
Then I positioned the newly shaped plug over the CCV holes and tapped the bar till the plug is flush all around. Next the socket to get that factory recess look. Don't worry if you knock it thru as you can get them back out and try again. The smaller drifts I used to massage the install!
to achieve that OEM look....well at least one of them came out that way!
The reason that I did all three per side with a 1/4" hole drilled thru them was Jerry posted up that the CCV holes in the head had all three drilled holes. I figure it can't hurt. I have a catch can so I'll mind the amount of oil it catches, which is not much now with stock 90 I/H's on stock 90 heads. Maybe we need more discussion on that fine point? I don't have much to contribute to a discussion on that level.
Anyway, that's the long & the short of it.
Tom