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hello I was wondering what sort of h.p increace I got by putting a 81 motor in my 71 z I put the carbs on left the p-79 head on with exausyt manifold and e.i ignition also new 2' exhaust pipe .

The car runs great but then again I am comparing it to a very tired l24 motor that was in it
 

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> hello I was wondering what sort of h.p
> increace I got by putting a 81 motor in my
> 71 z I put the carbs on left the p-79 head
> on with exausyt manifold and e.i ignition
> also new 2' exhaust pipe .

> The car runs great but then again I am
> comparing it to a very tired l24 motor that
> was in it

The 280-zx produced 135 bhp (SAE nett)in the US model.

What gain with the carbs & exhaust manifold?

Don't know, but the most powerful stock version of the L-28, in the 280-zx turbo, produced 180 bhp at 5600 rpm (SAE Nett).

My guess is you are around that 135 net mark, if your engine has higher miles on it. The stock L-24 new was about 129 hp SAE nett, 151 gross.
 
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