[Sevensecondsuv]

I was searching for ranger roller cam specs and ran across an article that discussed the differences between the 89-94 roller cam and the 95+ setup. Apparently the valve lift is the same on both cams but the 95+ cam has less lobe lift and uses higher ratio rockers to make up for it. Thus if you use the early roller cam with the late roller rockers you end up with something like 0.450" lift while maintaining the small duration numbers that make the ranger roller such a great cam for a street turbo setup.

Of course the late rockers are set up for the smaller 7mm valve stem so they need to be opened up a little for the early valve stem diameter. I'm dropping my head off at the machine shop soon so this is my opportunity to find a set of late rockers and have them opened up.

Anyone heard of this swap or can verify the numbers presented at this link?

http://www.route66hotrodhigh.com/2300Cams.html

[Mike Peyton]

total BS- and internet lore. the ratios are the same.

[Mavereq]

I think a lot of the info one that site is wrong

[TurboRay]

DITTO! :dunno:

[Sevensecondsuv]

OK thanks guys! I figured if it was really that simple everybody would be doing it.

[ThunderFaux]

Man that website needs to get taken down! I can't count the number of threads I've seen with a link to that site.

[Stinger]

I agree. Fits well in the "new" world of "alternate facts" though I guess.

[Paul LeDuc]

^^ :lol: :lol: :lol: ^^
Good one Shannon. :dunno: </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">

...and I verified it in my shop.

[Sevensecondsuv]

After more research it appears that the whole internet rumor got started with a typo in the Ford service manual for the 1995 Ranger where the ratio for the then-new stamped-style roller rocker was defined as being 1.86:1 instead of the correct 1.64:1

Amazing how much confusion one little typo in an obscure service manual could cause!

[Mavereq]

It just doesn't pass the common sense test for me. The lash adjuster, valve, and cam tower are fixed positions. If you're setting the geometry so the cam hits the roller and not the body of the follower, you don't have that much room to play with.