[MoreGAS]

Hi Tutle
Didn't want to seem to be busting your chops and I get it , costs pile up. You spent good money on ITBs and an ECU & harness, etc, plus a bunch of time will be spent making it all go together and work well -meaning drive nicely, stout performance, be reliable. To not put a moderately or more than a moderately sized camshaft in it , will not take advantage of the increased Volumetric efficiency that the ITBs can provide midrange and up. Keeping in mind these engines are just an air pump, and simply speaking if the valves are closed the engine will not do a great amount of breathing.
These 3.2 pistons( yes they are no more than 9.4:1 stock if Euro ) look like the surface of the moon and clearly Porsche did some work designing them to get a good A/F mixture homogeneous & over toward the single spark plug more effectively. This is why I suspect you will need quite alot of valve relief on the intake side. Whomever said it wasn't worth it I think was modifying a 3.6 L and that piston looks totally different( more like a reverse dome-great for twin plug) plus I recall they retarded the cam timing a bunch to fit them in without hitting. Thus not much of that applies to your situation, plus unless they did the engine with a stock cam, tuned it all then dyno'd, then did it w the Cam option 2, tuned it and dyno'd, one wouldn't really know what the cam change as installed was really worth. Worth saying that retarding the timing more than a degree or two likely means it is just the wrong cam.

If you cut the required valve reliefs for a moderate cam, Mod S a good choice, your compression would suffer quite a lot I think , 9.4:1 ish or less now (did you CC your heads I could calculate it for you as we've used stock euro pistons many times in a certain race class we had to be 9.5:1 in) down at least .3-.4 of a point compression perhaps more. Then you are staring at a 9:1 hotrod, wondering why you wasted the dough and didn't just leave the stock motronic on it....Coincidentally we have a set of 95 MM SC pistons(roughly some dome design) that came from a friend's estate that look like someone went to the same machine strum with deep reliefs cut in them, and through-the-towel-in on the idea. I'm in a similar boat on a 3.5 L Motronic engine I built for one of my streeters...But different. I kept the stock motronic injection , made a custom chip based on dyno x 2 , changed the cam 3 times, moderate(pretty good) to more than moderate(too much for the compression ratio and intake) and overdid it- lost power, then went back to custom moderate middle, and haven't dyno'd again yet. It feels better but nothing like The 3.5 L ITB engines we've done for other hotrod streeters. Given all the dough I have in this custom lump, The Motronic plenum intake just holds it back too much above 5800-6K and when I get time I am going to fit our ITB and Motec package on it to get all the performance that is waiting there.

These follies are why I suggested to change the pistons. It's like building a house on a hill w a great ocean view, then not putting any windows or glass doors on that side of the house LOL.

Good luck.
Kevin
GAS Motorsport