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Old 05-18-2002, 08:22 PM's Avatar is offline Moderator
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The 1/2" manifold spacers are needed when using 331/354 heads on a 392. The 331/354 are identical "small blocks" except for the bore. The 392 is a little taller "big" block. The heads from the smaller engines reportedly flow better than the 392 heads so it was popular to use them on the 392, thus the need for the spacers.
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