I said that I wasn’t really going to do anything more to this motor and I lied.  I picked up a used LS6 intake from a member on LS1Tech last weekend and it arrived today.  Took a couple of hours this afternoon and made the swap along with cleaning up alot of the gunk that was built up on the throttle body.

Here is a couple shots of the LS6 intake.  For being used it looks surprisingly new.  I believe the guy I bought it from said it was taken off shortly after the car it came on was purchased.  Most likely one of the C5 Z06 vettes or an end of line 01-02 F-Body.

Here is a side by side comparison of the two intakes from the top.  As you can see they are nearly identical with the exception that the LS6 is missing the provision for the EGR system.  I had already removed this from my car in the spring and had it capped off on the LS1 intake.

Here is a comparison from the bottom.  This is where you can tell by visual inspection which is which since there actually were some LS6 intakes from SLP that did have EGR.  The LS6 has a flat bottom where the LS1 has a rise in the middle.  This is also mirrored on the inside of the intake with the LS6 being flat and the LS1 having a hump.  This simple redesign in the intake allowed it to flow air so much better and gave gains of around 10 rwhp on a relatively stock car.  With a cam, better flowing heads, and an opened exhaust the gains are a good bit more but vary with cam.

All I am really missing to finish out this motor before building a replacement are some better heads.  I will not go all out and get anything ported/valved as there is no point in putting a ton of money into nice heads.  But if I find a decent set of stock 243 as cast for a good price I’ll probably pick them up and swap them on since they would flow a great deal better than my 853s and net me another 15 or so rwhp.  No rush on that however since I just had my heads off 3 weeks ago and have no desire to do it again so soon.