Im thinking of rebuilding my engine this winter and I have some questions. Whats the deal with using a 3.5 bottomend with 3.0 heads? I was talking to Dixit on aim a while ago about this and he was saying that even if you port the 3.0 heads, it would still be seriously limiting the performance.

I know at least two people have done this so far - tilley and japmax. As I recall tilley is using vq30det heads and japmax is using ported regular 3.0 heads. So basically I just wanted to get some opinions about the benifits and drawbacks of using a set-up like this. Are the vq30det heads a lot bigger than the regular vq30de heads? Any info on this would be much appreciated.

 

If you used the VQ35 heads, I think you would have a problem with the 4th gen cam pos sensor. That's the only reason I can think of for using the 3.0 heads. I hope someone finds a solution to this because I am putting in a new motor this winter, and it would be much easier to drop the entire VQ35 in. (me using 00 VI tho)

 

Read the other threads people. These questions have all been answered already.

 

VQ30det heads are same casting just have minor valve train differences (supposedly)