Cathedral ports/ rectangle ports
07-20-2011, 07:58 PM
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Join Date: Jul 2011
Location: Indianapolis, IN
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Cathedral ports/ rectangle ports So I have an LS1 and need to swap the manifold for a 4 bolt intake type. I understand that the LS2 is also a cathedral port motor. I bought an LS3 intake but it has the rectangle ports. I haven't pulled my LS1 intake off yet so can't compare directly. So, how different are these ports? Are the widths the same, height, but the upper corners are not squared off? Is this only a small difference, could I put the LS3 intake on my LS1 and it not be noticable?
