1972 3970010 block casting code info
Thread Starter
Racer
Joined: Apr 2013
Posts: 419
Likes: 15
1972 3970010 block casting code info
Hi, I have a 1972 3970010 350 block, 200 hp, that I'm trying to figure out some of the casting codes.
To the right of the casting clock is another circular type code that has 3 letters around the outside: they appear to be a D T and N, with a stamped pointer on the inside that points to one of these 3 letters. Does anyone know what this casting mark is for?
Lastly, just to the left of where the Cast Date is on my block , J261, are a couple of small round casting marks with a 3 in between. What's this 3 signify? Right after this mark is my casting date.
Thanks
Joe
To the right of the casting clock is another circular type code that has 3 letters around the outside: they appear to be a D T and N, with a stamped pointer on the inside that points to one of these 3 letters. Does anyone know what this casting mark is for?
Lastly, just to the left of where the Cast Date is on my block , J261, are a couple of small round casting marks with a 3 in between. What's this 3 signify? Right after this mark is my casting date.
Thanks
Joe
Team Owner
Joined: Sep 2006
Posts: 31,197
Likes: 4,287
From: Westminster Maryland
Hi J,
You're looking at the 'casting clock'.
The foundry kept track of both the hour and shift the block was cast.
D, T, N, stands for Day, Twi-light, and Night.
The clock represents the hour with in the shift that the block was cast. The slot in the screw points to the hour.
Interesting!
Regards,
Alan
You're looking at the 'casting clock'.
The foundry kept track of both the hour and shift the block was cast.
D, T, N, stands for Day, Twi-light, and Night.
The clock represents the hour with in the shift that the block was cast. The slot in the screw points to the hour.
Interesting!
Regards,
Alan
