MC vs 3B vs AAN Head Gaskets 
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Ok, some of these pics are hard to discern, sorry for that, but I was using a crappy camera. The gasket with the white oxidation is a stock gasket from a 3B engine, the other organic gasket (with the burned portion @ cyl 4) is a stock MC gasket, and the black metal gasket is the 'updated' 3B and AAN gasket which I used on my 5ktq.

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The metal gasket is under my burned MC gasket. Notice how ovaled the bore is on the MC gasket. A BRAND NEW replacement was identical.
The metal gasket is under my burned MC gasket. Notice how ovaled the bore is on the MC gasket. A BRAND NEW replacement was identical.
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Left to right - Metal AAN/3B gasket, MC gasket, and stock AAN/3B gasket (from a '91 200 20vt to be exact)
Left to right - Metal AAN/3B gasket, MC gasket, and stock AAN/3B gasket (from a '91 200 20vt to be exact)
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