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Hi Alessandro,
I have been watching the guidance you have been receiving and have refrained from putting in my two cents about that tiny blemish you are seeing on the heads sealing deck.
If you are worrying about that then do not look at new tires or fresh paint jobs.
Remember, mass production means more than one and will mean there are two different ones in the world.
Perfect cannot exist.
Lexus says “ In the pursuit of Perfection.” Yep pursuit of but can never get there as nothing is supposed to be.
I just waited and you are different than most DIY’s.
You have got to be kidding me, that your are so concern about that imperfection, that’s nothing more than a smudge on glass.
That area you pointed out before on the head before resurfacing would pass as nothing to worry about.
They took your money to appease you and gave you back a more flat head, as they all warp a tiny bit.
It’s called a tolerance specification so I hope that was in the intentions to correct.
Next thing, of all the places for it, it could not have been in a better place.
It’s far away from any coolant port and oil galleries that carry oil up through the head.
Its right next to a the head bolt.
That head was dialed in and machined absolutely perfectly and I hate using that word!
I stop at an excellent job.
I don’t even see feed lines from the cutting tool. Don’t even give J.B. Weld epoxy a flicker of thought here.
The machining person did what he was supposed to do and leave a witness mark.
With that he took off the minimum amount of material needed.
This way, if another person, a weirdo or cost plus mechanic, wants to call the head bad, for being too thin and that a person took too much off, he has the proof that he did not!
If anything, he cheated the dial to purposely and tilted the head a few thousandths to catch that area.
You’ll never know as it doesn’t matter one bit to the basic height specification.
Another thing that you need to know about is in that the head gasket materials themselves are not going to be as great as that head is right now.
They are pressed and punched and tossed about like nobody’s business.
Just remember it all gets crushed to form.
They have built in allowances for mass production and handling in ways that might astonish you.
I saw a event in the seventies while on a Honda motorcycle tour in Japan while in the Navy.
I was standing with a camera that had just clicked when I witnessed an amazing scene.
One of several engine crankshafts went into lower end cases and then there was One in particular had caught my attention.
The assembler was struggling for a few extra seconds, then all of a sudden, the assembler, reached up and a rather large rawhide mallet popped out from up behind a partition above his head, Bam and it drop into place.
It then magically disappeared and went back out of sight.
It wasn’t hanging there before or after with any other routine gadgets.
I watched that particular engine go all the rest of the way to see it eventually stand up on wheels.
It fired right up and ran on a dynamometer. It went through its paces as all the others bikes before and after it.
Now, is that the one engine going to go less or more miles than a normally assembled unit?
I have asked myself from time to time, was that crankshaft or its case made on different days of a week, both in the middle or was it one at each end? Variables are constant.
Which one had a problem, where, or do they all normally require that mallet?
Maybe a Yes on that and it was hidden from these U.S. Navy tourist.
The crew purchased motorcycles from the Navy Exchange and put them on board duty free. Not mentioned as a benefit during recruitment.
Yep Yamaha, Suzuki, Honda and new comer’s like the Kawasaki 500cc 3 cylinder two stroke pocket rockets. Short lived killers. You had to ride the headlight to keep the front end down.
But I bought a potato-potato Harley Sportster later on. Still have it.
My nickname in the machine shop was Tater as we had five Davids in the shop.
So nicknames were a must, even though clones, were still and hopefully are still stuff of science fiction.
Imagine man made clones being like the other stuff we make….?
What imperfection would you want to replicate anyway?
Just put that imperfect gasket in, to do its intended job and at let the engine move on just like the assembler did.
It will be just fine, as any car needs blemishes to give in to some of its own characteristics.
Phil
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