I Might Have Found Something Pretty Cool.....
- Thread starter RustyRatRod
- Start date
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Look at the short turn difference in the one on the left.
Yeah, I know, & I stopped short of the conclusion of the one on the right...over 20yrs ago! The width & ht of the pocket + bias is in circlepilot's thread. See that head has a -2 after the casting#, & l'm pretty sure it was an early(mid 70's) unit, wondering what the last versions -? Were....
I just showed pictures to my machinist. He said from the pictures he agrees that it's as cast and has not been milled. He's gonna get it soon as it arrives anyway. So I guess now all we do is wait. I will update accordingly.
CNC-Dude
Well-Known Member
Here's one a guy on .org had about 10 years ago and posted over here. Don't know if its similar to what you have or not.
66aCuda Rail And Argentinian Race head
66aCuda Rail And Argentinian Race head
slantsixdan
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Nifty! I haven't seen a head like this, so I can't comment affirmatively on what it is, but I can help pare away some of the guesses: it's not a marine or industrial head (same as passenger car), and there was no special factory LPG head—at least not in North America.
The weirdest part of this head isn't the nonstandard combustion chambers, it's the nonstandard combustion chambers with standard production casting numbers. Chrysler did sometimes put casting numbers and other such markings on prototype parts—the ones that were close to final form, and where production approval was anticipated. In every case I've seen or read about, proto parts got their own casting numbers; they didn't share regular-production parts' casting numbers. As shown here.
I agree the head looks like it was made this way, not modified. If it had been welded up and then ground down, we wouldnt' see the sandcast texture on the nonstandard wall of the combustion chamber.
I used to have an extensive library of documentation related to the development and evolution of the Slant-6. Nothing even vaguely like this ever appeared in it, nor is there anything like it in the list of engineering A-programs involving the Slant-6.
My best guess (still only a guess) is that this head originated outside the US or Canada, at one of the other places in the world where Slant-6 engines were made.
The weirdest part of this head isn't the nonstandard combustion chambers, it's the nonstandard combustion chambers with standard production casting numbers. Chrysler did sometimes put casting numbers and other such markings on prototype parts—the ones that were close to final form, and where production approval was anticipated. In every case I've seen or read about, proto parts got their own casting numbers; they didn't share regular-production parts' casting numbers. As shown here.
I agree the head looks like it was made this way, not modified. If it had been welded up and then ground down, we wouldnt' see the sandcast texture on the nonstandard wall of the combustion chamber.
I used to have an extensive library of documentation related to the development and evolution of the Slant-6. Nothing even vaguely like this ever appeared in it, nor is there anything like it in the list of engineering A-programs involving the Slant-6.
My best guess (still only a guess) is that this head originated outside the US or Canada, at one of the other places in the world where Slant-6 engines were made.
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Well, I found it on eBay in Michigan, so it's certainly not a stretch that it might have originated in Canada.
Thanks! That's the head I assumed Doug Dutra ended up with. I had forgotten Frank had it.
slantsixdan
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""My best guess (still only a guess) is that this head originated outside the US or Canada""
"Well, I found it on eBay in Michigan, so it's certainly not a stretch that it might have originated in Canada."
"Well, I found it on eBay in Michigan, so it's certainly not a stretch that it might have originated in Canada."
LMAO. Thanks for the input, Dan. Love me some cats. I'm stealin that.
Here's what Doug Dutra posted over on the .org site. Seems confirmed.
Closed chamber head.... - Page 2 - Slant Six Forum
Closed chamber head.... - Page 2 - Slant Six Forum
Chrysler’s headquarters being in Troy, MI may have something to do with it. May have been some R&D parts that ended up in people’s lunch boxes! Pretty cool piece!
Hyper_pak
Old School Chrysler Fan
You need to edit the title!
I found something pretty cool!
Good eye, I had seen it on the bay, but didn't see the chambers or want to pay the freight.
I found something pretty cool!
Good eye, I had seen it on the bay, but didn't see the chambers or want to pay the freight.
I thought it was a good deal even for a standard open chamber head since it's a low miles rebuild and included the Camcraft custom cam, lifters, pushrods and rocker train. It was a bad deal......especially considering what it is.
I can ask him. I didn't give a crap when I saw the closed chambers, but I'll ask him and report back.
LocuMob
Fluid Technician
"I want it, now!!!!"
Message sent. I'll let you know what he says. Casting number says 75-78.
He actually did know what it came off of! A 1977 Aspen. Imagine that.
The eagle....or unicorn has landed. More pictures forthcoming.
Ok here it bees. @Charrlie_S, I took the thickness measurement you asked for. I have not CC'd it yet, as it's pretty cold here tonight, so I'll do that tomorrow. I measured first, an unmilled open chamber "revised" chamber head and it's thickness from the valve cover rail to the deck is 3.614". The closed chamber head in the same place measures 3.625", so it is actually a little thicker. So, I would assume the closed chamber has never been milled. Certainly not milled from open to closed, which will be evident in the next pictures.
First, the casting number. That 2nd "4" is a 4, it's just a bad angle and the flash helped wash it out. Maybe that's a date code above it, I don't know.
Next, here is a really good chamber closeup. Very evidently an as cast closed chamber.
Here, I show the locator hole for the dowel pin. The as cast factory chamfer around the hole. No milling. Not even evidence of a broach or rock cut.
Here is a comparison between the chamber "smiles". I thought at first the closed chamber smile was a little smaller, but looking closer, I believe it's the same. I'll let yall decide.
And the closed chamber "smile".
That's it for now. I think beyond a shadow of a doubt, the head is as cast from the factory. I'll have some chamber numbers tomorrow when it's a little warmer out.
Rob
First, the casting number. That 2nd "4" is a 4, it's just a bad angle and the flash helped wash it out. Maybe that's a date code above it, I don't know.
Next, here is a really good chamber closeup. Very evidently an as cast closed chamber.
Here, I show the locator hole for the dowel pin. The as cast factory chamfer around the hole. No milling. Not even evidence of a broach or rock cut.
Here is a comparison between the chamber "smiles". I thought at first the closed chamber smile was a little smaller, but looking closer, I believe it's the same. I'll let yall decide.
And the closed chamber "smile".
That's it for now. I think beyond a shadow of a doubt, the head is as cast from the factory. I'll have some chamber numbers tomorrow when it's a little warmer out.
Rob
Hyper_pak
Old School Chrysler Fan
Now there is no 77 Aspen in the junkyard that is safe!
Got some numbers.
Chamber volume - 56CC's
Intake port - 87CC's
Exhaust port - 101CC's
Is it common for the exhaust to be larger than the intake? Measured each twice, so I duplicated.
Chamber volume - 56CC's
Intake port - 87CC's
Exhaust port - 101CC's
Is it common for the exhaust to be larger than the intake? Measured each twice, so I duplicated.
CNC-Dude
Well-Known Member
Dont know how it could, the intake ports have a visibly larger cross section than the exhaust ports do. Plus, the added volume under the valve in the bowl area makes the intake still much larger in that area alone....
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That's what I thought goin in, but it ain't so.
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