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The N-42 had square exhaust ports and the N-47 had round exhaust ports with the liners inside the port. The liners were used to heat up and aid in burning unused fuel for emission purposes.

> what is the difference beetween a 280Z n42
> and a n47 engine
 

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did the n47 is only for turbo engine because on my engine the head is a N47 and the cylinder block N42 and i dont have turbo
 

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The head used on the 280zx turbo was the P-90 and the P-90A. I have forgotten the # on the block, but it is not the N-42. I use the N-42 head on my turbo car, but the head was not originally designed for a turbo motor. The N-42 head came on the 280z in 75 and maybe on some in 76. The N-47 came on late 76-78 280z's. Nothing on your car is from a turbo motor, but that does not mean you can't use it in
turbo applications.

> did the n47 is only for turbo engine because
> on my engine the head is a N47 and the
> cylinder block N42 and i dont have turbo
 
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