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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
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02-07-2014, 06:24 AM
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A True Z Fanatic
Join Date: Oct 2009
Location: Canada
Posts: 1,156
Drives: 370z
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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. 
Last edited by Megan370z; 02-07-2014 at 06:27 AM. |
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02-07-2014, 09:37 AM
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A True Z Fanatic
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