Quote:
Originally Posted by scott70
I dynoed my # 64 headed 455 with 1 3/4" hooker headers and then switched to RA manifolds with 2.25 outlet dumping into 2.5" mandrel bent headpipes. About 18 HP and tq. difference.
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Here are the actual factory round port manifold outlet sizes 2-1/16" and 2-1/8" that the 455HO was dyno'd with. I might just have to get a pair of the 2-1/2" outlet RARE manifolds. It was shocking to see these had the same outlet size as the regular log manifolds!
Dennis