I have a pair of 62 heads and 2 pair of 462 heads and all three don't have a combustion chamber. Are the heads with combustion chambers the low compression export motors? I do know that the 62 2bbl intake manifold has narrower runners than the '63-up 4bbl. When it get light out, I'll go measure the ports on the 62 heads and the 1 pair of 462 heads. The other 462 heads are at the machine shop.
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