Manifold fitment question

DrEamer said

So, a side question here, does a Magnum block with it's lower deck height, cause an issue with intake fit when using a LA intake. I assume that if it were drilled for a LA it would be fine, but thought it worth the ask.

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The Magnum deck height is close enough to an LA that it does not usually add enough misalignment to worry about. You still have to check it just because of all the different part tolerances, especially since you are also talking about a modified bolt pattern or an aftermarket head for the LA pattern.