Forum > It's all about the Turbo...
Ranger Cam for a 87 Turbo Coupe Engine for my '74 Pangra
65ShelbyClone:
The difference in roller followers happened when Ford switched from 11/32" valve stems to 8mm, which I think happened for the '95 model year.
Wittsend:
And then there is that whole discussion about using the newer rocker arms with an older head/cam. One of these days I'm going to grab a newer rocker at Pick a Part (they are only $1 on sale days), grind the valve slot and see for myself exactly what the end result is. Some argue the "theory" while others say it can't be done. I don't know that either has convinced me.
Pintocrazed:
I'VE READ ABOUT THIS BACK WHEN I THOUGHT I WAS GONNA GET A PINTO WITH A 2.3 AND A FEW SAID YOU JUST OPEN THE NEWER ROCKER A BIT TO FIT AND THEY WORKED GREAT
65ShelbyClone:
I have a mill to use so the process is fairly trivial(if I wanted to do it); I just don't know if the rockers are case-hardened or through-hardened.
I already have an early Ranger roller cam, but have been dragging my feet on the install because it's not a performance cam and I might as well pop the head off and port everything if I'm that far in....and install bigger injectors...an d the intercooler... .and bigger turbo....and down the slippery slope I go. :o
Wittsend:
The thing I find interesting is that those who say it works never have any proof that it does. Like in, they never tried it. And those who say it doesn't work (surprise) don't show any proof that it doesn't. Like in, they never tried it. From what I can distill the later model rockers need to have about .060 (total) or .030 each side removed from the rocker guide (others have suggested turning the upper valve stem instead).
If one is articulate with a Dremel and a cut-off disc that shouldn't be too difficult. And remember, you are only cutting the sides so a large portion of the valve tip to rocker contact area (I'll guess at least 80%) will still be hardened. I doubt the side forces on the guides are much to be concerned about. I'd say this is at least feasible for trying.
The only way to increase the ratio is to move the roller towards the lifter (assuming it is already closer to the valve). I'd think that requires the roller be smaller to compensate. And this would seem to delay (intake)/advance (exhaust) valve events thus decreasing overlap ( ??? input from others appreciated). If the roller (in stock form) sat directly over the center of the cam then altering its relationship in either direction would decrease lift. However, from what I can see on a slider head/cam it appears the contact point is closer to the valve.
Should this all be feasible cam characteristic s could also be altered further by running a combination of new and older rockers.
Anyway, I'm not trying to claim this works. I'm only trying to look the process through its steps and see it on paper.
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