Originally posted by akrump47:
1) How would an oval port 3L be affected if it was run WITH secondaries since you've described it without?
2) With the 2.5L running "rich" at idle or light load ... was this with or without secondaries? Does this mean I could increase my mileage by driving harder?
3)Does the better oil drainage of the 3L effectively prevent buildup in the manifolds then? (If I am understanding what you are saying correctly about the oil separator)

BTW ... you should post some videos of you and your car in action!


1. It may work with an opened up UIM and changed IMRC point.
However IMO I really see little benefit gaining more power below 2500rpm unless you like cruising in your slushbox.

2. Without secondaries. The fuel atomization of the 2.5L was pretty bad at low speed and idle so it ran very rich. It was near impossible to tune. That was my "only" con to not having them. (cold weather start up was terrible ) Ever single other aspect was infinitely better for my driving style.
It's not remotely an issue with my 3L setup. (yes night & day opposite)

3. Yes it helps tremendously.
If no oil is "consumed" by the engine through the intakes they "said" build up will not occur.
Throw in the fact I have no secondaries (I/E horrid stagnant hot air) and fuel goes to BOTH valves and thus no build will occur and rob significant power.

My original Idea was to join both ports anyway for those reasons. Ford has since already done that with the tumble port (oval) heads so I just improved on their start.

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