[Green Hornet]

Just wondering what date codes would be correct on a late Oct 76 block cast (77 W72)

I'm finding spring 76 and a lot of 78...but nothing too close to block

[78w72]

ive heard & seen date codes for heads can be off by a few months up to ~6 months, all based on finished head supply to be used on engines before a new batch was cast. same for other parts, dates can be off by quite a bit sometimes. im sure others will have better more accurate info on this though.

[Brock1030]

Interesting data point for all the W72 cars. Block cast dates are documented, but have not seen anything on the 6X4 heads.

My car is a late 11/78 build, ‘79 Y84 W72. As with all 78-79 W72’s, the block cast date is 11/77 and the heads are both cast dated as 2/78 within a few days of each other.

Not sure how this compares with other ‘77, ‘78 and ‘79 W72 cars.

[Green Hornet]

I have several 78's here that I checked...all 78 builds...and all 78 coded heads

[Jay S]

My original 77 W72 Julian codes are K176 (Nov 17, 1976) for the engine and L166 (Dec 16-1976) for the heads.

6x-4 heads the earliest I have is a L085 (Dec08,1975 from a 350? and a J1667 (Oct 77) from a later 350 or 400.