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wow those pictures are big! I guess this means no one knows what they are. I have had a couple of local experts look at it, always with the same result; They are baffled. One thing is certain... it...

They are cast iron. Here are some pictures

HI Kurt
There are no markings on the corners of the heads.

thanks all

the block is definatly a Cleveland ...
if they are 400 heads are they any good on the 351?
I would like to run somewhere around 10:1

I just bought a 69 Mach 1. The car came with a 351 Cleveland, condition unknown. The engine was transplanted 20 years ago but was never fired. The Heads are not marked with a 2 or 4. they are casting...