Originally posted by Derk2000:
1) That groove/cup thing that you cut out for the fuel injectors...how do you know the fuel is really going to shoot down the port?


The injector's spray gets evenly distributed to each... Riiiiight...

I would estimate 35% of the fuel gets to secondary valve. It's main benefit is keep it clean. An added benefit is better fuel atomization.
The secondary port air enters at a faster speed and helps pull the injector spray.
Also the shared tumble port design helps as well.

Low speed atomization is much better. I had no problems tuning the 3L at idle or low load. Even cold.
The 2.5L without the secondaries ran very rich at idle. Deadly so when cold. Poor fuel atomization at low cfm demand.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.