ssanto

Hi,

I'm looking at a set of 823 heads to use as cores. The pictures look like the two heads are different in a couple ways. First picture - see at the top the circled area is different. Second picture - the 923 casting number looks different

What does this tell me? Are they off two different cars? Is this normal differences?

RB04Av

The circled area is the same. One just has a plug in the water hole (didn't have a crossover fitting in that place).

The casting # pretty much tells all, as far as what casting # they are. Those are both 823. However they were probably cast in 2 different plants, with the left one cast in May of a year ending in 9 and the right in Oct of a year ending in 6. They're just acoupla random heads, not a "set". I believe I'd try to find a couple that are a better match, if I could.

Che70velle

iTrader: (6)

The top pic shows one steam port has been plugged, and the other isn’t. No biggie. If you want to run a four corner steam setup, just drill the plug out. It’s basically a rivet.
As far as the casting numbers looking different, it’s no big deal either. An 823, is an 823. They might not be a set from the same engine, but that doesn’t matter at all.

JRFed

Same casting, same foundry just different batches, different dates. Those GM castings were cast by a company called Nemak.