Translate head casting code
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,712
Likes: 3,631
From: North Central Wisconsin & Shitcago
Translate head casting code
Long story but my rebuilt “Original” L79 67 coupe engine froze an intake valve. It is at the shop (A new shop) and I stopped by and was shown the stuck #3 intake. I got to looking at the heads and casting numbers and was wondering where these were when they left GM
Right casting looks like 8890462 over H 166. GM 3
.Left casting looks like 8890462. K 166. GM 12
thanks for helping.
Right casting looks like 8890462 over H 166. GM 3
.Left casting looks like 8890462. K 166. GM 12
thanks for helping.
Melting Slicks
Joined: Aug 2004
Posts: 2,056
Likes: 553
From: Sun Prairie WI
RH
3890462, H is August month, 16th day, 1966, GM3 is the pattern number for mold used when head was poured at Saginaw Grey Iron
LH
3890462, K is November, 16th day, 1966, GM12 pattern number
3890462, H is August month, 16th day, 1966, GM3 is the pattern number for mold used when head was poured at Saginaw Grey Iron
LH
3890462, K is November, 16th day, 1966, GM12 pattern number
Last edited by vark_wso; May 14, 2021 at 08:25 PM.
Le Mans Master
Joined: Sep 2009
Posts: 9,151
Likes: 481
From: "You may all go to Hell- and I will go to Texas- Davy Crockett
St. Jude Donor '12
wow.... if someone changes a camel hump head because of a dating inconsistency, that is taking obsessive/compulsive to a whole new level. You sure don’t want to look under the valve covers of my 63.
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,712
Likes: 3,631
From: North Central Wisconsin & Shitcago
I have no plan to change it. I just wanted to know exactly what I have. This is indication the motor has had some serious fault that was fixed by replacing one head.
