Just acquired a 1967 Delta 88. Carb is a Quadrajet, block stamp is 389244D. However the number stamped on the front of the passenger side head is N681957 and even though I have the FSM I can’t reconcile this number. Any ideas?

Thanks!

 

Just look for the letter code on the corner of the head.

 

Its the engine unit number and the letter is the model line.
N is for Delta 88 I believe. See link to post below.

https://classicoldsmobile.com/forums...s-engines.html

 

Found it - large B stamped on each head. So mine's a '66 motor in a 67 Delta 88.

 

1967 Delta with a big block used a 425 with C heads.

 

The "N" prefix on the engine unit number signifies a 1966 425 4bbl motor. At least the HEADS on your engine are from a 1966 model.

 

1966 was B heads while 1967 was C heads.


What casting letter is on your heads?

 

Answered in Post #4

 

Thanks.. missed it.

 

Interestingly the engine color is metallic blue - could this be a toro motor?

 

A Toro motor would have a "T" suffix on the engine unit number. The early Toro motors are pale blue, not the 455 metallic blue.

 

I’ve got a drill hole next to the fill pipe (see picture). Does this change anything?

 

Check here on the pass. side. These are 66 B heads for a 400 442.

 

That's SUPPOSED to be a threaded hole where the strut for the alternator bracket mounts (for non-A/C cars). If it's drilled out, someone f'd it up.

 

Thanks Joe - I'd misunderstood where the famous engine drill hole was located. On closer inspection this is a threaded hole (this is an AC car and the compressor and brackets were rolling around in the trunk :-) )