Re: Coolant Circulation
The rear passages in the heads don't have any flow as the manifold is blocked off in this area. The front passages are clear because there's flow thru these passages when the thermostat opens. I'm not sure what these nasty deposits look like but some are normal as this is a dead spot in the cooling system. I would not bypass the back to the front as you'll create flows that may damage your engine from over heating. Do you have any pictures of these deposits?
69 SS, 350/300 h.p., M-20, 12 bolt, matching numbers.
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