04whitefx4

i want to change out my stock rocker arms with a little bit bigger ratio has any one ever done this on there 5.4

dereku

Correct me if I am wrong but my understanding of overhead valves was the camshaft rode directly on the lifters and actuated the valves.

Thought they were more efficient without the pushrod or rocker arm.

04whitefx4

I have no clue about fords motors iv all ways been Chevy

dereku

Well these are over head cams. I know the chevys 4.8 and I think the 5.3 are still pushrod motors so those should have rockers.

But the ford shouldnt.

You can get a performance cam tho.

04whitefx4

Ok thanks for the info on that learned some thing new about the 5.4 that was gone to be plane b is the camshafts

otto457

The cams in these motors don't give much gains either. VCT already does a lot on that front.

04whitefx4

What's vct

otto457

Variable cam timing. It allows the cam to advance/retard as needed via oil pressure. All the 04+ 5.4L use this. The theory is to provide the best cam position for most any situation without actually having to change out the cams.

http://en.wikipedia.org/wiki/Variable_Cam_Timing

04whitefx4

that makes since otto457 i see that you have efans did you have a fan clutch are did you do an efan mod

otto457

Yep. All the 04-08's had a mechanical fan that can be converted. I used two 16" Derale tornadoes that flow around 2500 CFM a piece, and a DC controls FK-85 controller.