they have any big issues? Can you swap out the heads to get a 4v? or would there be a bunch of other stuff you would have to do?
Pretty sure you can turn a 3v into a 4v but you'd need the wiring harness from a later model navi with the 4v (which I have) but they are also setup a little different and if he is wanting to throw a roush charger on there he is just better off staying 3v. If I was dead seat on charging mine I would have just built a 2v with a kenne bell. But mines gonna be unique
I'm dead set on this one, it is going to be a complete build on the truck so don't worry. I'm just focusing on the motor. Down fall on the 5.4 4v is the 3v heads make better torque, port and polish both of them, the 4v will make better horse power and the 3v will make better torque. Just pick your favorite poison. :3
Christ, everyone here making bank and I've put in 3.5 hours in the past 2 weeks... You really want to port and polish the heads? These 3V heads already flow fairly decent out of the factory, you'll definitely gain something but for the cost of having this done it might not be worth it. You may also consider Jesel followers if you're going to be spending a lot of time in the higher RPM range. Comp Cams also makes a VCT limit block which is compatible with their higher lift cams, but you need custom tuning for it. Sounds like a great project brother, I'd just hate to see you do that "California rake" that you F15dy guys do. The 3V was '04-08 in our generation, and '09-10 in the 12th generation. The new 5.0 Coyote is a DOHC 4V while the 6.2 is a SOHC 2V. I never drove the 6.2 but I'm not impressed by it's powerband or it's numbers. GM's OHV motors of the same displacement make more power and use less fuel. The 5.0 Coyote doesn't have low end torque that the 5.4 3V has, I know this because I drove it. Regarding the swap of a 4R75W to a 6R80, it is possible and you are correct you need a PCM from an '09-10 truck plus some custom tuning, but it will mate to a 5.4 3V motor.
