[SD455DJ]

Originally Posted by jciwolf

Can't find any numbers on either head, only numbers are 1043 and 1063 right and left plus the gm3 on both. If there are more than that it would have to be further up on the heads and no offense I don't want to pull the covers. Any other ideas would be welcome. jciwolf

jciwolf, those are the date codes on the heads, so cast January 4 and 6, 1973 which will point to 4x castings with 2.11/1.66 valves, possibly with screw-in rocker studs, and have 98 cc chambers. These were the standard head on the 400 4-bbl engines for 1973. On the left cast boss next to the valve cover there should be a stamp of 3, 3H, 4, or 4H (most likely 3/3H for the 73 castings).

Dennis

[jciwolf]

Thank You Dennis for this information. I just got paper work from a previous owner who had work done on this car. Apparently he had the motor bored and the cam enlarged. He said he wanted to restore the car, but new child and lack of body skills and wiring and of course the big enemy, money. I will be reading the paper work and motor service report this weekend. Stand by for my results!! Thank You again for the information and your time researching this for me. I am thoroughly Impressed with your knowledge and help, and the forum. So glad I joined in. jciwolf

[jciwolf]

Sorry it's taking me so long to post a reply but the unthinkable happened tonight, I was entering a rather long reply and the site logged me out on timeout! Apparently it didn't notice I was still typing and logged me out due to no entry! I will try again tomorrow. jciwolf

[Held for Ransom]

Originally Posted by SD455DJ

jciwolf, those are the date codes on the heads, so cast January 4 and 6, 1973 which will point to 4x castings with 2.11/1.66 valves, possibly with screw-in rocker studs, and have 98 cc chambers. These were the standard head on the 400 4-bbl engines for 1973. On the left cast boss next to the valve cover there should be a stamp of 3, 3H, 4, or 4H (most likely 3/3H for the 73 castings).

Dennis

They would be dated I043 and I063 which would be Sept 4th and 6th, 1973, making them '74 heads. Now they could be 46 (350) or 4X (400 or 455) heads, found on the center port. And the R45TS would point to the 400/455 head (350 used the R46TS plugs).

[jciwolf]

According to the notes I have gotten, previous owner wrote down 4X heads. You are right on the money!! Hope you can read my 4/7/17 post, lots more things on this goat. Most I am not sure of. Thank You again for your help and time. jciwolf