It would be safe to say that the OEM 370z injectors are 37lb fuel injectors, if the stock fuel pressure is 51psi on the 370z.
I'm not sure what the 370z fuel pressure is though.
If these were being sold from a company, they would probably be listed as 34lb injectors at 43.5psi.
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2008 Nissan Titan Crew Cab 2wd
JWT C8/S7 cam package, Full Bolt ons
372rwhp/447rwtq Uprev Tuned @ Z1 Motorsports
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