question on the 71 HO motors. when did they do the change over from the early to late block? 483667 is listed as the early block casting and 485428 is listed as the late block.
i sold a couple of 1971 trans am's to a guy back in 1990 and he called the other day looking for an auto block for one of them. he still has the XF 70 4 bolt block i gave him but he is trying to find a 71 casting number block, i'm just not sure which he needs.
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