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Ah, I see it now ... I wonder what that is too.

I also notice that the water temperature switch on the front side of head was moved from the right side (as 1971-1973 A12) to left side starting with the 1974 engines.

rgrinder, thanks for explaining the casting numbers. It seems none of us knew what they meant until now. This should be a big help in identifying parts.

i dont know what it is. this engine was from USA and im portuguese, we dont use this in here.
All my other engines dont have this.

The car were this engine was in, have air conditioning. maybe is from the ac.

Those things that I can see in the two inlet ports on the left are valve guides & a part of the inlet valve stem.

That item in the left side welch plug hole, is that a block heater? It seems to have a spade type electrical fitting.

thanks rgrinder, i didnt know that exists.
this head was a bad surprise, because is round ports, i thought it would be oval.

here is the picture.

what is that things inside the intake holes?

once again thanks to all

swirl ports heads didn't come until 81-82 and have casting #'s of H95 and H99
what yours does have is exhaust air injection, the thermostat housing has a provision for a one way valve and the head has a hole in it next to the water jacket that leads to the exhaust ports. not good or bad, just a pain to work with if you want to port it.
what it did was inject air into the exhaust stream to allow a more complete burn of fuel in the exhaust manifold, kinda like having an air pump without actually having one.

thanks man,

that means this head have the swirl ports.

the worst head ever , isnt it?

It's a H728 , as in factory part number 11041-H7280, used aproximatly 1976-1980 for California emmissions. If you look at the second pic. just to the left of "728" is a spot where the "H" should have been. Obviously it's not there, either the mold was disturbed or it was intentionly removed, but like I said careful examination shows where it once was and "should still be.

finally i have pictures. tomorrow i will take the manifold out to see the intake holes.

Ah, 1977 B210 USA model. I happen to have the factory service manual for 1977.

These engines only came with one cylinder head:
- standard "oval ports"
- 30mm exhaust valves
- 37mm intake valves
- large "open" combustion chamber

It should be more or less the same as the H72 head.

Unfortunately, no one seems to know what the casting numbers signify.