Is there really a difference..??

LocuMob said

LD4B is an aluminum version of the stock intake manifold. I wasn't sure about the port size.

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I don't think that's right. The LD4B is to the 318 what the LD340 is to the 340/360. It's a pretty stout small port dual plane intake. The regular Performer is closer to a stock intake than the LD4B is.