Posted By: johnnyd
How do I tell casting dates on 452 and 346 heads - 03/21/17 02:44 PM
How do you read the casting date on big block heads?
On 906 heads made '68-'70, I think it's easy. For example I see under the valve cover is a code attached near the cast part number. For example on a 906 head one might see 11269 which would be November 26, 1969.
I think I have it down for the 452 heads which were made '76-'78. A 452 head might have the numbers 1677. Is that the 167th day of 1977?
On 346 heads which were from '71-'73 I can't figure it out. A 346 head with 2230. I am thinking 223 day of 1970 but I thought the 906 head was 1970. Please help!
On 906 heads made '68-'70, I think it's easy. For example I see under the valve cover is a code attached near the cast part number. For example on a 906 head one might see 11269 which would be November 26, 1969.
I think I have it down for the 452 heads which were made '76-'78. A 452 head might have the numbers 1677. Is that the 167th day of 1977?
On 346 heads which were from '71-'73 I can't figure it out. A 346 head with 2230. I am thinking 223 day of 1970 but I thought the 906 head was 1970. Please help!