identify auto heads

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I need to know what these heads are.
They are aluminum with # HQ0303-11-111-0606-0300.

[rustydogy]

is that the only # you can find on it ? do you know manufacture ?

[[email protected]]

There is another number on the front of the head, it is 606-2-IS. It is a heavy duty. small block, chevy head. Maybe aftermarket, as there isn't a brand name on the head.

[rustydogy]

my guess is you may have to take it to a builder they may no a way to decode it for you ,I cant find any thing out on either of those #s, maybe a few pic from different angels would help I maybe able to at least match up with other aluminum heads by little tell tail signs