Heat riser flap side is always larger at least on the standard log manifolds. The opening for the flapper is machined to about 2.10’’ and the other side as-cast opening is about 1.90”.
On some of the earlier style log manifolds manufactured without the flap there’s still that same difference in outlet size between the right and left manifolds.
It wouldn’t surprise me that the openings are different by about 1/4” on the long branch manifolds.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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