Heads came off a '99 Dodge Ram 1500 LA block.

There are two casting numbers that I see. 5300, and 671. Which one would you use to look for specifications and parts?

Also, speaking of specifications, all I've been able to find is how much it weighs and varying prices, lol.

Does anyone have the technical specs for these particular heads?

 

If they have 5 valve cover bolts they are LA, more they are Magnums.

If Magnums lots of specs can be found.

 

They're Magnums.
I was confused for a second because there are 5 bolt holes on each side of the head, thought they were LA.
Should be able to find specs since they're the more popular, thanks.