Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 12, 2016 8:00:21 GMT -8
Gentlemen, I need help. No, not that kinda help, well, probably I do, but I'm requesting help that you all can provide. The really knowledgeable with various heads on hand could probably answer these questions: 1)Various AMC V8 heads between '67 and 1971 had a casting mark at the front of the head. Sometimes the mark would be a single vertical raised ridge and sometimes two vertical raised "hashmarks" were cast side by side. Is there any correalation between year and markings?
2) Any pattern of marking for rectangular port vs dogleg port heads?
If you need a pic of the detail I'm looking for let me know.
Thank you.
Steve
|
|
|
Post by sc397 on Jan 12, 2016 8:14:58 GMT -8
Yes, we need a picture.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 12, 2016 8:31:57 GMT -8
I'll send when I get back in afternoon. It actually may be horizontal ridges. I'll check.
S
|
|
|
Post by sc397 on Jan 12, 2016 9:29:19 GMT -8
Well if they are horizontal, it is probably for pleasure...
|
|
|
Post by Captain Awesome on Jan 12, 2016 12:18:02 GMT -8
Sounding like RB Mopar 346 heads. They had 2 slashes.
|
|
|
Post by spud on Jan 12, 2016 13:04:17 GMT -8
Those are single rib heads. Aka srh's... not to be confused with sst's. They were cast with polyneucleictransglypherol, or Pntgp, which was hoped to be a more economical and renewable replacement for water, which it ultimately proved not to be. Early in production the new casting formula proved problematic due to the smell, which was nearly identical to that of a turkey roasting, which drove foundry workers mad with hunger, to the point of at least two cases of self canabilism. Interesting footnote indeed.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 12, 2016 13:58:45 GMT -8
link
Go to the link and mouse over the engine image. On the front of the heads where the front freeze plug is on the left head, just to the right of it in the picture you'll see an 1&1/2 to 2 inch long single vertical raised "hashmark". On a '69 390 head, for example, there are two such marks, side by side. S
|
|
|
Post by sc397 on Jan 13, 2016 5:01:09 GMT -8
It could have something to do with how the Air Conditioning bracket bolted up between the two years.
|
|
|
Post by 69Rebel on Jan 13, 2016 11:02:25 GMT -8
Can you re-phrase the question? I totally don't understand what you are asking.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 13, 2016 11:33:41 GMT -8
link
If you go to the link and hit the enlargement feature it will allow you to scroll over the enlarged pic. If you look at the passenger head in the photo you'll see the three accessory bolt holes right next to the exhaust port on the head. Right below the lower outer accessory hole is the cast-in mark or line that I'm talking about. This line goes down to the parting line between the head and the block and sticks out from the recessed, rough cast part of the head just below the flat, machined pad where the three accessory holes are drilled. This vertical line is distinct from the ledge that is cast-in on the other side of the the cylinder head closest to the intake manifold. The horizontal ledge, or line, is the piece you normally tap with a hammer to loosen the head from the block. It's visible in the pic as well. The up and down oriented "bold relief" line I'm talking about sometimes has a second one located right next to it with maybe a 1/4" gap between the two lines. When I can get over to storage I'll take a photo and circle the twin lines at the front of the passenger side head on my '69 390 engine. I need to know if there is a definite foundry pattern that separated earlier engines (343/390) from later 360,390,401 engines with dogleg ports via these lines cast into the heads. The reason is the head I'm trying to identify is in a 47 year old photo and I have no way of prying off a header or pulling off a valvecover to identify the head origin. It's on a '69 race car.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 13, 2016 22:34:25 GMT -8
'73 360 with 090 heads: Circle around single vertical cast-in line: '74 401 boat engine 502 head: '70 291C head: '69 390 with 558 head:
|
|
|
Post by 69Rebel on Jan 13, 2016 23:03:15 GMT -8
OK. I get what you are asking. Why is it important? AMC junk is just AMC junk. Sorry to say, but it's not like doing the detective work on a Yenko Camaro. 47 years ago is 1969. So you are asking about a motor that was made between '66 and '69. Like most AMC stuff, it was probably cast in the erstwhile Holmes foundry in southern Ontario.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 14, 2016 6:54:09 GMT -8
If it were a production engine. There's a reason why it's important and you were very close when you mentioned Yenko...
|
|
|
Post by sc397 on Jan 14, 2016 7:02:55 GMT -8
Don't get too excited. I have seen heads like that before. I would be more interested on the hand stampings.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jan 14, 2016 7:07:21 GMT -8
The photos I have to study aren't that detailed. It's the exhaust and the heads in poor photos. These must mean something and there appears to be a cutoff between '69 and '70,
|
|