Consider buying a 502 for my 242SS
#22
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Stainless Marine should fit ok and still give you a long dry run with tails that reach near the transom. With that power level I would be certain that engine needs performance exhaust with a longer dry run to avoid reversion.
I have stainless marine that I plan on putting in my 242SS. The tails are not ready yet but I think they will be around 20" or better which will give a very good long dry run for a performance cam.