high ratiorockers for 5.9-12v,24v, 6.7l, 6.0l,7.3l,6.6l

Hamilton Cams

Hamilton Cams

ignorant
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Jun 28, 2007
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We will be releasing our new stock or high ratio rocker arms in the next week or so. They will be for the 3.9l,5.9l 6.7l 2 valve or 4 valve per cylinder, 6.0l and 7.3l. Duramax is still under developement. These can be in stock or high-ratio. Custom order on high ratio. Pricing and pictures will be posted on our new website in the next week or so www.hamiltoncams.com

Zach Hamilton
 
Waiting on anodizing, they are $1499 per set for the 12v. Call me at the shop for more info. 1-512-778-6150


Zach
 
Last edited:
Hamilton Cams said:
We will be releasing our new stock or high ratio rocker arms in the next week or so. They will be for the 3.9l,5.9l 6.7l 2 valve or 4 valve per cylinder, 6.0l and 7.3l. Duramax is still under developement. These can be in stock or high-ratio. Custom order on high ratio. Pricing and pictures will be posted on our new website in the next week or so www.hamiltoncams.com

Zach Hamilton
Click to expand...

what is the stock ratio of the 24v motors?? and what is offered as high ratio
 
Im just thinking here:

Run a drop in billet cam and compensate for the lost lobe height with the higher ratio?

Or just gain more total lift?
 
High ratio rockers fattenup the lift and at duration at X lift across the entire cam lobe. They are not necessary however they do give you that extra edge. Stock 12v ratio is 1.69 +/- a little (high oem tolerance) we can take them up to 1.8 but it is up to the customer to clearance the head or get our reverse taper pushrods if necessary. The stock 24v is 1.38 int 1.34 exh. +/- i believe. These ratios are actually all over the place depending on which year model the rockers came out of and if they are made in brazil, usa, india,or mexico. Once again we generally try to get another point out of them which takes them to 1.48 and 1.44. Thse are mainly for competition but can be run on the street. They have a roller tip to cut down on side loading of the valve and reduce friction, and a bushing for the fulcrum. I suggest their use only after the customer already has addressed the cam springs and pushrods. If all these are used I also suggest the use of an oil addative to replace the zinc that was taken out of the oil. Such a small price for insurance. All these components together greatly increase the velocity and lift of the valve and related components.

here are some pics.
http://i240.photobucket.com/albums/ff203/zacheryhamilton/100_0815.jpg
http://i240.photobucket.com/albums/ff203/zacheryhamilton/100_0819.jpg
http://i240.photobucket.com/albums/ff203/zacheryhamilton/100_0826-1.jpg
http://i240.photobucket.com/albums/ff203/zacheryhamilton/Copyof100_0829.jpg
 
Zach PM me some info on these. My head is pretty much ported, I would be curious about these. What point are they needed?
 
WOW those are very nice....

hmmmmmmmmmmmmmmm Damn this place....
spend.gif
 
Could you put a set of these on with a stock cam and see some gain, or would it be a waste of time and money without a cam replacement? Joe
 
If the factory cam lift is .300", .010" lash a 1.7 ratio rocker nets you .501" lift . With a 1.8 ratio your lift will be .531". Yes they will make a difference. The rockers job is to just magnify the lift off of the cam. If you go up a full point, the acceleration of the valve, duration @.050" , and total lift all increase. Because of this if you start with a larger cam profile, the benefits will be even more dramatic. With the extra lift, head porting may be necessary. Stock 12v intake ports start stalling out at about .450" lift. What good is all that lift if your head won't flow any better? For the benefit v.s. money I would do the cam first, or all of it at the same time.
Zach
 
I was thinking I could do a set now and gain a little extra untill I'm ready to do a complete build. Will the use of a high ratio rocker with my stock cam clear the piston. You do make them for the common rail don't you?
 
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