Not mine, but available: https://www.facebook.com/share/1DVr5zMKcx/
It has open chamber heads. Look at the close up of the 4, note the dot next to the 4.
I think $1200 might be a little high.
Good catch - those later open chamber heads are prone to pre-ignition knock.
That discussion rings a bell: Open chamber vs closed chamber - #14 by Gyrhead
Yeah, I should have said the dot “most likely” means later open chamber heads. Apparently not always true.
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