340 4 barrel and 340 6 barrel: were they really UNDERrated?

Remember those guys that bought into the old rumor of a Wednesday car?
The theory that a car built on a Wednesday was somehow a better built car because on Mondays, they were hung over from the weekend and on Friday, they were looking forward to quitting time and the weekend. Somehow, cars built mid-week supposedly had more attention to detail?

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Sometimes though, an engine runs much better than the rest. Maybe a positive tolerance stack up?
I've driven numerous Chevy 350s. Some were gutless, some hauled ***. One was in a 75 Camaro owned by my Brother's friend. It idled smooth but flat out scrammed. I once had a 318 that wouldn't even peel out in gravel. That one had a timing chain replaced and somehow, it was THREE teeth retarded on the timing sprocket! Once I found that and replaced the chain and sprockets, the dude hauled ***!

I know you say all that tongue and cheek, but I can remember well some cars were just plain faster and quicker than they shouldda been. @krazykuda Karl can attest to it, as well. He worked on the line for Chrysler for a while. He has some stories to tell. In fact, I got one. I had a friend whose father had a 1970 Impala four door. Just a family car. BUT it had a 300 horse 350 in it. Most were garden variety 250 or 270 horse, but this one got the 350/300. Every now and again David, my friend, would be granted use of the car. We'd go out terrorizing people in it. It was the ultimate sleeper. Four door and that GM mint green. We whooped up on many an unsuspecting opponent.

Then, David got a 69 Camaro. 250 horse 350. So one day we were over at David's and he kept looking back and forth at the Impala first, then the Camaro. The family was going on a long weekend vacation, but David, since he now was 18 and had a job, was staying home. Yup. We did an engine swap between that Impala and David's Camaro. The old man never knew the difference, because he never romped on the Impala to really know what it had. But David's car was now a holy terror. Now I fully admit, we were young and stupid. What was actually a 300 horse motor "could" have seem like more "JUST CAUSE" we were young and stupid. But both cars, first the Impala and then the Camaro claimed LOTS of victims "WE JUST KNEW" should have bested us, but didn't.

It isn't so much as what day of the week, it's more of when the holidays were if it matters at all...

As far as horsepower, it's just some run better than others, it may be the tolerance stack-ups working in your favor...

But as far as quality, you want the ones made when there was low absentee... The 'regular' operators on the line do the same job over and over day after day... There is a floater for each section of the line that will fill in when the regular operator is away from the line for a bathroom break if possible... The floater knows each job in that section as they fill in on the days the operator is off...

Then you have the popular long holidays, where the operators take their vacation time... Sometimes more than one per section of the assembly lines... They have to find substitute operators to fill in the lines to keep them assembly lines running... If there are not enough assembly line workers (say before or after a long weekend vacation for the negotiated union vacation day and they cash in a couple of their vacation days [PTO] to get a longer holiday break) to run the assembly line, they borrow operators from other departments... In an engine factory, they borrow the operators from one of the machine lines as the assembly line gets priority... The machine line can be run without an operator as the machine operators usually are required to get the machine running and then do a check part every hour to make sure the machine is running parts to print/spec...

The substitute operators take a little time to get through trhe learning curve for the assembly line job and that is when we saw more defects/repairs on the assembly lines... The regular operators know the job the best and have better quality and speed to keep up with the line...

So on the days where there is high 'absenteeism', there are more repairs and misbuilds because the substitute operators don't know the job as well as the regular operators... Those usually occur before or after one of the extended union negotiated vacation days off when people cash in their personal vacation days to get longer time off in a stretch...