Captain Obvious

Old brain cells, but I believe the default (if it's unspecified) aspect ratio back then was about 80 percent. And if you do some calculations on the listed specs in the document linked to above, they come out to be just that. For example... They indicate the overall diameter for the 175-HR-14 to be 634mm. Using that as a starting point, if the tread width is 175mm, then the aspect ratio calculates out to 79.5%. = ((634 - (14*25.4)) / 2 ) / 175 = 79.5%

As long as the idle is at the proper level, I don't think any of that matters. The idle speed will be a factor of the addition of all the leakage paths around the butterfly, and long as the idle speed is where it belongs, it doesn't really matter which of all of the sources is passing the air. For example... If someone mucked with the butterfly stop and opened it up a little bit, you would just compensate for that by closing down the idle screw a little bit. As long as they didn't open it so wide that it was beyond the compensation range of the idle screw (completely closed), then I think it should all come out in the wash. The idle air flow will be the sum of what goes past the butterfly valve, what goes past the idle speed screw, and what leaks through the BCDD.

Yup. A couple years after Chicago.

Good heavens, Miss Sakamoto! You're beautiful!

I don't have an answer to the torque spec, but I just wanted to commend you on your plating results. Seems you're really getting the hang of it. Those look great.

Fred, Gotcha. I misunderstood your message. So you're still in OH, but at least your stuck WITH your Z's!

Fred, How did you get to be stuck in Ohio and separated from your Z's? That doesn't sound like a good plan.

Haha! Well remember that I'm no expert! I'm just a hack with a hydraulic press and a couple micrometers! Choo-Choo.

Groan...

Jeff, When I said "if the piston is sticking even without the needle installed, then it should stick even without the dome installed on the carb body" what I meant was... Since the only point of contact between the piston and the carb body should be at the bottom face of the piston (and that's only when it's all the way down), then the binding you're experiencing must be caused by contact between the piston and somewhere inside the dome. And if that's the case, then you should experience the same binding just by slipping the piston up into the dome and trying to move it up and down. Even before screwing the piston and dome onto the carb body. I was looking for confirmation that the binding occurs with the piston up in the dome, but without the two of them even being attached to the rest of the carb body. I'm in agreement with the above... If there wasn't anything dropped or banged around during the rebuild and they didn't stick before the rebuild, then it's most likely just a mix-n-match issue between parts from the two carbs. And I know it's probably not the issue, but I gotta ask... Everything is spotless clean, right? You don't feel grit/sand/dirt grinding away when you slide things together?

Don't remove any metal. If the piston is sticking even without the needle installed, then it should stick even without the dome installed on the carb body. In theory, the only part of the piston that should contact the carb body at all is only at the bottom face when it's all the way down. So unless the suction piston is bottomed out all the way down, the only part of the piston that should EVER contact ANYTHING other than the tube at the top is the little anti-rotation slot. And that should be a sloppy non-binding fit. With that in mind... Did you try mixing and matching all the domes, pistons, and carb bodies? Maybe something got mixed up during the rebuild? Did you accidently drop a piston or a dome? The clearances along the "sealing" face along the outer rim of the piston are very small and it doesn't take a lot of distortion to make things not work properly. Maybe look for anomalies on the precision machined surfaces under magnification? Like a bump or burr kicked up by hitting something by accident?

Haha!! I have a memory like a steel trap.

LOL!

Well the offer still stands to bring them to my shop. My press will put them together at room temperature. No oven, no freezer, no grief.

You mean Ironside?

Haha!! Yes! That's the one!! So clearly, once again, you have shown that you and I have the same arsenal of jokes. Stupid immature 13 year old humor. One may follow the above joke up by jumping out from behind the stack of boxes and yelling "SUPPLIES!!!"

Don't sell yourself short. You may still have. Seriously though, glad the smoke wasn't anything serious.

Well there's your problem! Whoever did that head work screwed something up. It's really a shame that the valve missed the relief in the piston. I wonder if that's because of the larger valves? The stock valves were smaller? And might not have hit the piston? Nice metal head gasket. Looks like it was sealing well. And head studs/nuts instead of head bolts. Clearly someone made a lot of changes in there. Too bad they weren't all done correctly!

Stone knives and bearskins!! https://www.youtube.com/watch?v=F226oWBHvvI Might be my favorite line as well. Certainly in the top five.

Well if there's anything that can be considered "good news" in all this, it would be the fact that you have found the smoking gun to your tapping and lash pads flying out.

I heard about some guy who torqued his cam-sprocket bolt to only 36 ft-lb.

Whoa, whoa!! Don't be badmouthing Spocks Brain. There's some great stuff in there! "Brain! Brain! What is Brain!?!??" Now THAT's acting!! And my personal favorite..."A CHILD could do it!! I use that reference a lot, but unfortunately every year fewer and fewer people pick up on it.

Well that sucks. So far, you've had a lash pad fly out... twice. And a valve seat come completely out of another location, right? That head is clearly questionable and I wouldn't do anything else without it until it's been seriously evaluated.

Yeah, that's the point of my comment about a "little bit" of wiggle to one person can be a whole lot to another. I could maybe wiggle the parts and think it's nothing extraordinary, but without actually seeing them it's all relative and subject to perception.