Guest Anonymous Posted December 12, 2002 Share Posted December 12, 2002 Which would be a better head for a street application w/ an aftermarket turbo add on. I have both already. I'm looking for 300-350 rwhp. Thanks Steve Quote Link to comment Share on other sites More sharing options...
Mike C Posted December 13, 2002 Share Posted December 13, 2002 The N47 is a roundport head and the N42 is a square port, so it depends. If you use a stock L28 turbo manifold go with the N42, if you are going to modify a header and you have a round port, use the N47. Quote Link to comment Share on other sites More sharing options...
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