Building the Nissan VQ37VHR part 2

Next the VVEL system is prepared for installation by adding a bead of sealant around its base.  This part is a non serviceable part according to Nissan.  In fact the entire head is considered to be not serviceable by Nissan and you are really not supposed to take it apart.  JWT has found that as long as you don’t touch any of the adjustments in the VVEL system you will be ok.

Next the exhaust side of the head has a bead of sealant laid down.  Now the VVEL system can be bolted down to the heads.

The cam gears, and intermediate chain are readied for installation.

Next the cam gears and chains are installed with the timing marks lined up.

Cam gear bolts are tightened down.

Our WPC treated JWT billet oil pump gears are installed in the oil pump housing and lubricated.


  1. Replacing with upgraded oil gear only is sufficient versus full upgrade of oil pump assembly and cover? Always pondered the value in doing so or maybe there’s a horsepower threshold so any insight is appreciated.

      1. Kojima-san, thank you for sharing your insight so I decided to purchase the full assembly including the billet cover from Boundary. I also opted for their MartenWear for convenience since they also offer this service although there are other things I may reach out to you separately regarding WPC. Stay well.

  2. Other than the bizaro heads the block looks similar to the VR38 and drag racers are pushing around 1100hp out of the stock block, 1700hp with sleeves, and up to 3000 on a billet block.

    The VELL is trick but it locks you out of a lot of otherwise simple modifications.

  3. What are the benefits from using the larger valves from a titan truck ? Was there any modifications done to make them fit ?

  4. Hi,
    In the build you used the Titan valve is sodium filled for better cooling and is 1 mm larger for better flow. As the VQ35HR is similar will the same valves fit as was done on the VQ37VHR if so what is the OEM part number so that I can purchase them.
    Thanks for your many articles on Nissans

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