240Z, 260Z, 280Z Performance / Technical Discussions related to performance motor enhancements, upgrades.

n47 head

Old 12-10-2005, 08:01 PM
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n47 head

does the n47 head have square exhuast ports or round. I am looking to swap to a L28 engine but not sure about the exhuast ports on the new head. will I need a new exhaust header or not?
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Old 12-12-2005, 02:10 PM
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Well, this guy's page is usually a really good guide to the spectrum of Datsun L series heads:
http://www.geocities.com/zgarage2001/z.html
and he says the N47 has the diamond-shaped exhaust ports.
I just last week took my intake and exhaust manifolds off of my '78 L28 in preparation for getting the block cleaned for a rebuild. It does indeed have the exhaust "liners", and by year also should be an N47, but I remember looking at them and thinking "square", as opposed to diamond. I'll look again tonight as I have to get the left side freeze plugs out next anyway.
Given you've got a '71, I'd say you're looking at a different exhaust setup. Of course, if your donor L28 comes with an exhaust manifold or a decent header, then you're all set. As long as you're going to all this trouble, though, it sure is a good time to put on a really nice exhaust... aside from the money, of course.
good luck,
Dave
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Old 03-14-2006, 08:15 PM
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use the head from your old engine on the l28 block if you have it. Anyways, the square exhaust ports flows better then the round ones on the n47
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