All 5.7 from 09 to present are designated Eagle engines and 6.4 are Apache in cars and Jeeps and BGE(or big gas engines) in trucks are VVT engines. The heads on these engines along with the 6.1SRT all have ruffly the same intake ports and the intake manifolds will all bolt up. The 03 to 08 5.7 heads have a different intake port, plus the early 5.7 blocks have a wider peak at the front of the block so the Eagle, Apache, and BGE manifolds do not fit without spacers and/or slight modification. I am not sure but I think the 6.1 block has the same wide peak as the early 5.7 blocks so there could be interference with these too with the later 5.7, 6.4 intakes. Only the 5.7 Eagle truck engine and both 6.4 engines have the SRV (short runner valves) in them. The 5.7 Eagle car and Jeep engines with the throttle body bolted straight out the front do not have SRV valves. Both 6.4 intakes are a torque and horse power up grade on the 5.7 Eagle, especially when combined with a performance cam and long tube headers. Hope this helps.
P.S. the SRV valves in these intakes are computer controlled to switch from long runner to short runner at around 4800 rpm's, or you can use a MSD 8969 rpm window switch to activate it at any rpm you like.
