Header question
I know this sounds pretty stupid of me, but how can I tell if I have square ports or round ones without taking the manifold off? I was thinking of getting a set of headers, since they seem to be going for fairly cheap.
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The easiest way is to look at the casting number, which is on the other side of the head towards the front. As far as I know the square port heads are E31, E88, N42, and P90 (turbo). The N47 head has the round ports, and the P79 (ZX) head is diamond shaped.
Phil |
P79 diamond? I've never heard of that before. I think the P79 is lumped along with the round port heads. Maybe their exhaust runners are a slightly different design than the N47... but so far you're the first to mention it. ;)
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