[quote=arch]should not be a problem. i cut in a 4" port on a 5.7 this spring and it was assembled as you describe, with a thick fiberglass seam where the two halves came together. the port, being screwed or riveted adds some continuity around the opening for strength.
if you would like two photos of the work, get me an email and i'll send them. i have trouble getting pics to load into forums.
j[/quote]
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