[johnta1]

See if I can get some blood flowing here!



Doing some digging, looking, cogitating, etc.

Here's a pic of the early engine codes for 1973.



Notice no XD/ZJ SD codes? (also no Y8/W8)
At the bottom it says W8 & Y8 use hardened iron foot (lifters)

Now in the pic from HPP article from years ago:




Look closely at the driver head: Y8
I think most people assumed it was a 1974 model SD engine?

Look at the hanger paperwork:
It says 1973 at the top of the paper. (plus the usual SD stuff elsewhere)

The engine behind it is a 350 of course, but that code is for a 1973 350.
(none in 1974 with that code)

I have quite a few EUNs for K112 cast date Y8's (and other early date codes like that)

So,

1st they are more than likely pre egr fiasco
2nd they would not probably have the partial VIN on them
3rd they must have been removed from the engine line for rework
( Would they have the 1st style cam probably?)
4th Since they had Y8 (and W8?) on them they could not be used in 1973 cars

Now on the thread here:
1973 Y Code SD

Would his SD be a Y8 or the XD?

Also, would the 'Y8/W8' engines be held until the 1974 model year? (after rework- intake, cam maybe, etc)

Just think if the EPA hadn't found the egr problem (or found it a lot later) how much power the SD would have made?
(along with it being in the GTO, etc possibly)


Just wish I could have been there in the plant back then.