"213" heads, anything special?

[LeadfootBob]

Finally got around to looking at the casting number on my 440 heads. I always thought they were 906's - turns out it's a set of 213's without the extra coolant holes, not sure about the spark plug sizing yet.
They've been ported, nothing extreme from what I can tell. Heat crossover ports have been welded shut. The guy I bought them from claims he _lost_ 3hp going to Edelbrocks, sounds a bit improbable...

Anything noteworthy about these things?

[FLG]

I think there basically the same just with modified cooling passages??

Dont take my word for it.

[Troy]

I have 213 heads on one of my 68 440s (not currently in a car). I had read that they were basically just early versions of the 906 heads. What's the difference in the cooling?

Troy

[b5blue]

3751213 are listed as 1973 "motor home" heads in the b-rb mopar book. "similar to the 3462346 71-72 head except it has extra cooling passages next to the spark plugs which helped durability" (346 heads have flatter intake ports to clean up emissions, they reportedly out flow the 906 on the exhaust side but do not have hardened seats installed for unleaded gas they are induction hardened only) 

[Troy]

Eh, I'll likely never use them any way but it helps to know this stuff.

Troy