1966 Hemi engine identification

[Highpoint]

Hi guys, can anyone tell me what the stamping means on this 1966 Hemi?

 

[Phantomcobra]

My guess would be the PH 426 means Plymouth Hemi 426 although the Plymouth Hemi I believe was the actually called the Commando.

 

[696pack]

That is "B" H 426 B= the model year code of 1966
H= Hemi
426= engine CID

the 3 8 24 2 numbers below is where you find the assembly date of the engine how ever it is supposed to be 3 digits, month and day, so I don't know how to ditermine which numbers will corolate without the SPD of the car.

 

[Meep-Meep]

I think I also see the WT stamp running about 90 deg from the other stamps. WT = water test. Curious about all the different numbers toward the bottom.

My 66 HEMI block has a 10 29 or 25 on the bottom and I think that's the build date. Since my block is cast Jan 18 66 then I have to assume the assembly date was 10 of 1966 and installed originally in a late 66 car?? Normally I would think a build date of 10 66 would go into a 67 car but perhaps I would have a CH 426 on the pad instead of a BH.

 

[696pack]

I think I also see the WT stamp running about 90 deg from the other stamps. WT = water test. Curious about all the different numbers toward the bottom.

My 66 HEMI block has a 10 29 or 25 on the bottom and I think that's the build date. Since my block is cast Jan 18 66 then I have to assume the assembly date was 10 of 1966 and installed originally in a late 66 car?? Normally I would think a build date of 10 66 would go into a 67 car but perhaps I would have a CH 426 on the pad instead of a BH.

Are you sure it is not 1 29 or 25? If the letters in front of the 426 are CH then the block was intended for a 1966 model year car. You are correct if the engine was actually assembled in Oct. (10) it HAD to be for a 67 (C) model year. It could simply be a factory worker screw up.

From what i have read on the web and talked about with others that havre looked at a lot of early Hemi engines there seems to be a lot of strange unexplained numbers stamped in this area.

1966 cast Hemi engines were used into the 1968 model year. There were no 67 cast Hemi engines.

 

[Meep-Meep]

Didn't know there were no 67 castings. I'll look again and get a picture of the pad but I'm really sure it says 10 25 (or 29) and not 1 25. It would be cool if it was a good fit to my 66 Belvedere with the Jan 26 SPD.

Didn't mean to hijack this thread but figured it was all relative info.

 

[696pack]

If that is the correct stamping then it is obviously a factory screw up as the assembly date is too late for a 1966 model car and should be a "C" stamping rather than a "B" unless of course someone shaved the pad and restamped it incorrectly.