Edelbrock heads with OEM manifolds

RustyRatRod said

I don't believe Edelbrock (or anyone else for that matter) made aluminum heads with the thought that anyone would ever run exhaust manifolds on them.

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Probably true, but my 340's power noticeably improved just swapping from OEM to Edelbrock heads on my 340, while keeping the stock exhaust manifolds. Of course, it runs better now that it has headers.