ConcoursMustang Forums

1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1966 Mustang => Topic started by: Josep on December 07, 2015, 08:00:39 AM

Title: What this number means.?
Post by: Josep on December 07, 2015, 08:00:39 AM

Hello all,

noticed a casted number "13" (attached pic) on the bottom part of the engine, in the drivers side. What this means.?
Also, this number 6E25_ . Looks like the top part of the number was not well casted, but I'm pretty sure is this number. See pics please. What's the significance of this 25 May 66..?

6R07T213966 San Jose build 11 June

Title: Re: What this number means.?
Post by: GT500KR on December 07, 2015, 08:34:58 AM

Guessing, but the cast "13" probably refers to the mold used for the casting. Stamped numbers look like assembly date code in this case May 25 1966.

Title: Re: What this number means.?
Post by: Richard P. on December 07, 2015, 09:30:06 AM

Quote from: GT500KR on December 07, 2015, 08:34:58 AM

Guessing, but the cast "13" probably refers to the mold used for the casting. Stamped numbers look like assembly date code in this case May 25 1966.

+ 1

Title: Re: What this number means.?
Post by: J_Speegle on December 07, 2015, 04:57:53 PM

Quote from: Josep on December 07, 2015, 08:00:39 AM

Also, this number 6E25_ . Looks like the top part of the number was not well casted, but I'm pretty sure is this number. See pics please. What's the significance of this 25 May 66..?

That is when the engine (in this case a 6 cylinder) was assembled - last letter would have been an initial for the worker who assembled it for accountability purposes

Title: Re: What this number means.?
Post by: Josep on December 07, 2015, 07:25:06 PM

That's what I guessed. Many thanks all for your interesting and helpful posts.