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Here is the pic of a 350 olds head my brother filled with the zinc alloy. This is right after it was done and the excess zinc still needs to be blended back to match the rest of the bowl shape with a porting bit.





This is probably the best way to do this job as it makes the exhaust flow better thru those two ports. If I had the heads off and more time/foresight, i would have rather done it this way.