Holley stumble trouble

^^^^This is what I’ve suspected the whole time. Question is, how to correct it? I’m not sure I’m interested in trying to drill out these tiny holes or press in new ones. Perhaps a replacement adjustable metering block is in order here. I briefly considered a ProForm main body but they do not come with blocks and there is no provision for a vacuum advance port if using my existing block.

Negative. It’s the primary. I’m gonna measure again to be sure but I was pretty careful the first time around.


Don’t let drilling and tapping a few holes screw you up. You can do it.

I have a metering block that’s more whacked than yours, and when it cools off I’ll post a couple of pictures. Waiting to hear from Tuner. I suspect he’s pretty busy, but when he calls me back I’ll fill him in and see what he says.

He is a sharp guy.