The carbs are the #1812 Edelbrock 800 cfm AVS units. We had them box stock on the MP cross ram. 113 jets, 68/47 rods and 101 jets. On the cross ram they were a little rich, AF was 11.9 during the pulls. But we didn't lean it out since a couple of cylinders were up in the 1350 temp range while others were down around 1100 degrees. So it needed to be tweaked but we didn't want to spend the time dialing it in.
On the Indy x box the carbs were way lean. We jetted it up to 104 on the secondaries but it was still lean. It could've gone 107 or maybe even 110. There was still some cylinder to cylinder variation but not as much.
The Indy manifold doesn't come with any gaskets anywhere so my guess is that it is full of vacuum leaks. We tried to seal it up with RTV which is okay for some dyno pulls but that wouldn't last long on a real engine. That manifold really needs to be redesigned so that it has o-rings seals internally and on the tops. Some good viton covered washers under the intake to head bolts would also be a good idea. That way you won't have gas leaking down in to the oil pan.
