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That's the same thing I did. Did replacing the lifters take care of the tapping noise?

The ones I bought didn't have a chamfer on the base. They measured either .900 or .905.. . I can't remember which.

I replaced all of the lifters today with oem style ones. Engine is much quiter and the knocking has gone. However, during the break in period it backfired through the exhaust when I would get it up between 2500-3000 rpm. I'm wondering if it has something to do with either the MSD box or the...

Actually that's an older picture from last year. The lid is on tight right now. I'll have to pick up a dial indicator anyways.

Yes.. the front of the cam is pink.

For reference, the old lifter is on the left. The HT-2011 is on the right. Seats are different and accommodate the newer push rods. Mine are not. The HT-2011 is also shorter like the original early BB lifters I picked up. I'm going to assume that these lifters came with whatever cam he put in...

So I swapped in two of the new lifters on #8 cylinder and the knocking went away. So far. It's not idling smoothly though and when I was breaking the new lifters in it popped through the exhaust twice during the 20 minutes. After taking the stethoscope around it after break in, I'm hearing faint...

I noticed the noise was much more prominent on the back of the intake valley pan. The rocker arms sounded more noisy on the left rear also. I pulled the inspection cover off the bellhousing and watched everything while it was running. Nothing out of the norm. Sound doesn't change when pushing...

How did you make out? Just curious since I'm having a similar issue.

Since it seems more correct I'm thinking I should just replace all 16 instead of the two that are making noise.

I ordered a set of new lifters for the early 413 motor. First thing I did was measure it and it's .044" shorter than the ones currently in it. The cup seat looks correct but I can't measure the cup height of the old one because it keeps sinking down, as you can see in the one picture.

I can see that. I compared both and the sb ones are the same diameter but slightly shorter.

The hole you're talking about,I'm assuming, is the intake port on the head? I had stuffed paper towels in each intake and exhaust port for that very purpose. To keep crap out. Seems like I'm going to have to pull it back out and tear it down again. Yay me...

Yes. That is new. Didn't do that before all this started. The carb sat on the shelf for about 3.5 months.

If the carb were totally out of wack, or in need of a rebuild, would that make the motor knock if it were running too lean?

I did a compression test and here are the results. (Cylinder #- PSI Reading) 1-160#, 2-175#, 3-160#, 4-180#, 5-165#, 6-161#, 7-164#, 8-150#. It seems to me cylinder 8 has something going on?

So this thing has small block lifters in it?? I didn't know they were interchangeable. They look a lot like ones for a big block from CompCams or even Summit's version.

That's exactly what mine look like. So I have an early model valve train. Great. I was hoping the previous owner changed all that with the cam swap. All well.

Ah, yes..I did notice the seat was a little different. I talked to a guy at Summit too and he said the same thing. I took a couple of the lifters in question apart to see if the springs were broken and they weren't. But that doesn't mean anything I suppose.