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Maybe this is a dumb question..but what of the so-called "wide block" 318 Poly? Is it the same block as the LA? Is it the heads that make the poly look so wide?

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Yes, the poly 318 block isn't any wider than a wedge 318 block.

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Thanks, 413, once again you are a great source for classic Chrysler motor specifications!

As a side note, wouldn't it be great if you could get speed parts for the poly head..or better yet have an aluminum poly SR head produced that would bolt on to a later LA 4 bolt block.