I’m wondering about a few things that I’d need to address if I go with engine and I realize this might be the wrong crowd but clearly you folks have lived with these motors so you’ll have lots of experiences to draw on. My build starts with a clean sheet of paper so there’s lots of possibilities. Right of the mark I see the stock intake is not going to work so I’m thinking ITB using 2 pairs of 4- 41 mm GSXR750 TBs married to the stock elbows cut to make vertical stacks. ITB gives great control over air charge so the secondaries can go away. It’s possible go even further but then it starts getting the injectors involved and without a flow bench that’s not where I’d venture to go. On the LS I changed the intake to LS6 and it woke the engine up so intakes are huge in the power making department. But as I wrote the stock one won’t do and 8 polished stacks will look killer atop the engine. I see a lot written about carbon build up on the intake valves and for sure a lot of that is due to the stupid EGR setup. The LS1 had EGR and those engines too have the same carbon issues and in 02 the engineers found another way, essentially by tuning but also by adding a separator box which I notice the 3.4 has also so I’m thinking delete EGR all together EDIT I got EGR and PCV mixed in together. Clearly the separator box is PCV and nothing to do with EGR. I think carbonizing of the intakes though has a lot to do with reversion of exhaust gas in the valve overlap and I read the Cam on the 3.4 is 3/4 race so the exhaust valve is open a lot longer than what’s typical in a mild crammed engine and without a good scavenge a good amount of hot gas is going to finds its way back up the intake. Thats maybe why the crap is backed all over the secondary butterflies. So what I’d do is build properly matched headers and flow them through high flow 200 cell Cats and dump the exhaust with the least restriction, probably a couple of Vibrant ultra quiet resonators and that’s it. This method should pull the intake charge into the combustion chamber and avoid reversion and with a bit of luck make the engine scream. What do you think?