Pan heads machine shop decipher needed

Information on the identification and numbering of frame, motor belly, transmission and other parts
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64duo
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Pan heads machine shop decipher needed

#1

Post by 64duo » Thu May 22, 2008 3:17 am

Look at these heads borrowed from an auction site. I'm assuming the indented dots on the left of the casting represents some information to the machine shop that may have worked these over at some point. Can anyone read the language and tell me what this means to a machinist/mechanic type person. I've seen it before but since i'm neither I have always wondered.....
Thanks
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Joe G.

#2

Post by Joe G. » Thu May 22, 2008 3:40 am

Looks like a hardness tester???

Are you going to bid on those heads? I was kinda interested in them too. I have a set of pre 55 and would like a set of 56s.

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#3

Post by 64duo » Thu May 22, 2008 4:00 am

Joe G. wrote:Are you going to bid on those heads? I was kinda interested in them too. I have a set of pre 55 and would like a set of 56s.
No, gone on. I'm simply trying to understand the world around me mechanically.

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#4

Post by Revette » Thu May 22, 2008 11:57 am

Joe G. wrote:Looks like a hardness tester???
They look a bit large for a hardness tester. It is possible that it is production coding from the foundry. I deal with a foundry that has four patterns for a part we machine, and parts from each pattern have the pattern code plus a code for shift poured on.

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#5

Post by Cotten » Thu May 22, 2008 2:58 pm

Since they go one, two , three and four from front to rear, I would bet that somewhere there are rockerblocks with matching dimples.

....Cotten

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#6

Post by PanPal » Thu May 22, 2008 4:53 pm

I would agree with Cotten, they are witness marks. I will also add the casting date of 56, does not mean these heads are 56 heads. My 59 heads have the same casting code as did many others even though fin sizes changed.

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#7

Post by mogman » Thu May 22, 2008 9:57 pm

Panpal is correct my 58 improved cooling heads have a 56 casting.

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Re: Pan heads machine shop decipher needed

#8

Post by 58flh » Thu Jun 23, 2011 1:08 pm

Cotton is correct in this isue with the dimples--(they are witness marks & nyes the rocker-arm +blocks will also be dimpled to!. There is no method to this madness--its just what 1 machinist prefers to another!. (I my self do this all the time I do a motor--I use them in other hidden areas to.) 1 day 9yrs. later you get a motor-job --& behold its one you did already, now you look-up your records & you know exactly what was done to the engine at that time!. It really is a big help. A couple of us know eachothers marks so when a job comes in ---there it is all the what & who & did this is gone!---a real BIG-HELP!-Good-Luck everyone have a great weekend!--58flh (Also what Mogman said is true my 58 has 56 headcastings also)

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