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Old 03-11-2018, 12:49 PM
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60sstuff 60sstuff is offline
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Join Date: Sep 2002
Location: Left Coast
Posts: 2,975
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The 64 heat riser “weight” is different from the 65 and newer style.

Below is a NOS 64 RH exhaust manifold (first 4 pics).
Last pic is a pair of 65 manifolds.

Same bolt pattern on all of them.

Chris.
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Last edited by 60sstuff; 03-11-2018 at 12:55 PM.