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Megan370z · 02-07-2014, 07:24 AM

the intake valve spring are much stiffer than the exhaust valve spring .
I dont remember the number but they are in the book.

Im sure they are good up to 9000 but the exhaust one, I wouldnt go higher than 8300-8400.

I tried ordering those intake valve spring but Nissan didnt want that.

If you need a side by side VHR Vs HR .. look at this.. I should have put the spring rate too..
but only the VHR intake valve spring are stiffer .. everything else has the same the spec.

02-07-2014, 07:24 AM	#2 (permalink)
Megan370z A True Z Fanatic Join Date: Oct 2009 Location: Canada Posts: 1,156 Drives: 370z Rep Power: 24	the intake valve spring are much stiffer than the exhaust valve spring . I dont remember the number but they are in the book. Im sure they are good up to 9000 but the exhaust one, I wouldnt go higher than 8300-8400. I tried ordering those intake valve spring but Nissan didnt want that. If you need a side by side VHR Vs HR .. look at this.. I should have put the spring rate too.. but only the VHR intake valve spring are stiffer .. everything else has the same the spec. __________________ Megan Journal Click Me ....................One Man Team Motorsport Click Me Last edited by Megan370z; 02-07-2014 at 07:27 AM.