W2 head part numbers

[joes68340s]

Does anyone have access to the head casting numbers for old W2 head castings. I need to know which head this casting numberis.3870810. If long valve or short, econo or race. Thanks

 

[lenweiler]

Not the econo long valve. I've got them on mine. As I recall the no. begins with a 4.......

 

[joes68340s]

Thanks I have been looking for the econo long valves, but everyone seems to be selling the standard valve,