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Chris
Dodge Dakota
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11/29/2005
17:29:57
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 Subject: Roller Rocker ratio???
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Good Afternoon all,
I was browsing the Xmas parts catalogs and found that Harland Sharp makes a 1.6 roller rocker for the magnum motors... Mopar parts also has 1.7 rockers. I've been searching and searching for the cam specks and rocker ratio/spring coil bind numbers of a 2001 Dak R/T (obviously the 5.9L).
Can anyone shed some light on this...
What are the stock rocker ratios and are they roller?
What is the stock spring coil bind?
What are the stock cam specs?
Can a 1.7 rocker be used under the stock valve cover? I doubt it... but thought I'd ask anyway.
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gen1dak
Dodge Dakota
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11/29/2005
18:34:53
| RE: Roller Rocker ratio???
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Stock ratio is 1.6:1 on the Magnum, 1.52:1 on pre-Magnum. Non-roller on both.
With the 5.9 Magnum, the max lift is .410", so going to 1.7 rockers (.435" lift) is within the limits of the stock springs. The 5.2 cam has .432" lift, and it uses the same springs....just don't plan on much more than that or you'll exceed the spring tolerances. Naturally, going with some stronger springs will yield better high rpm control, but this isn't much of an issue in the .430's" range. I don't have the coil-bind numbers in front of me, but you'd be okay with the 1.7's. The aluminum rockers are too bulky to fit stock valve covers unless you take a hammer to them and "clearance" them a little. The stainless rockers will fit without mods, but are more costly.
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Mr Cam Man
Dodge Dakota
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11/29/2005
20:43:03
| RE: Roller Rocker ratio???
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Go here and scroll down to Dodge V8 and V6 info.
http://www.harlandsharp.com/bolton3.htm
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Chris
Dodge Dakota
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11/30/2005
11:48:17
| RE: Roller Rocker ratio???
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Thanks guys
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dr. dakota
Dodge Dakota
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12/01/2005
20:55:43
|  RE: Roller Rocker ratio???
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I went with the crower 1.7 adjustable rockers they work great.A great improvement over stock.The only thing is that you have to modify the valve covers. Very easy to do.
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