My set-up is below.
Basically, I would go with 3L heads. Why...?
1. They have the extra oil drain-back holes that the 2.5 heads don't have. So those long right turn on-ramps, and oil starvation due to right turns, is no longer an issue.
2. With 2.5 heads, the CR is pretty high. The 3L heads will keep it modest and safer if you choose to go with a turbo or something later on down the road.
3. Larger Valves
I've seen similar numbers with both options. I tend to see a little bit higher numbers with the 3L heads over the 2.5 ones. Of course, that doesn't mean much because bolt-ons and tunes play a role in everything. On top of that, it seems more people with 3L heads post their dyno #'s than those with 2.5 heads do. So that might be a bit jaded.
2000 Contour SVT
SF - #542 of 2150
3L: SVT Cams/LIM/UIM/Optimized TB/MAF
HMS Trans: Torsen/SS Forks/Synchros/Zetec FD
Mods: K&N/MSDS Headers/Trubendz Y & Catback/DMD/Steeda Short Throw
Tuning: Xcal2 with PRP
Susp: Bat Euro Kit
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