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Old 12-16-2007, 06:57 PM   #1 (permalink)
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Roller Rockers

Anyone use the Miller Roller Rockers advertised in the Classifieds on this site?
Any input on them?

302 351W Miller 7075-T7 Aircraft Aluminum SBF Roller Rockers
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Old 12-17-2007, 12:24 AM   #2 (permalink)
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Re: Roller Rockers

I bought a set of 1.7 ratio. Haven't installed them yet. Saving up for the custom length pushrods that will definetly be needed. (3/8" screw in studs, Manley SS valves, and the rockers of course. All these things change correct geometry significantly.)

Some information I found out about Miller Engineering Rockers (Mid-Lift)
I knew there was a reason I had been holding off on full roller rockers, now I know why. If you understand geometry, this will make alot of sense, if not, it will teach you. (I have noticed on Comp Cams, Crane, etc, they are starting to talk about mid-lift, now that the patent is up. hummm.....)

Jim Miller knows his stuff.

Enjoy - MILLER ENGINEERING INC
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Old 12-17-2007, 01:22 PM   #3 (permalink)
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Re: Roller Rockers

retyler,

You would be really happy with the Miller SBF rockers. They are brand new, grade A, top quality rocker arms and are made of high quality materials. This is especially true when compared to the ebay cheapo rockers of the same selling price (our price for the Millers is less than half their original retail price...hence the great value and quality over the "el cheapos").

Installation is easy and they come with instructions that make establishing valve train geometry about as simple as possible, thanks in part to a "measuring face" incorporated right into the rocker body's design.

We are an authorized distributor for Miller Engineering products. People sometimes ask why they don't hear much about Miller Engineering rocker arms. My explanation is that Miller Engineering specializes in the manufacture of their very high end Pro-Stand and Pro-Shaft rocker arm systems. These exotic Shaft and Stand rocker systems start in the 4-figures, and are what MEI is known for (and the circles that they are known within), and so these stud rockers are secondary to their big ticket exotic rocker arms and the customers who use them. And so, here we all have an opportunity to get a set of stud rocker arms from a very high end rocker arm manufacturer.

For some recent positive feedback about the Miller SBF rocker arms purchased through us, click HERE.

Paul
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Last edited by paulkane; 12-17-2007 at 01:27 PM.
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Old 12-17-2007, 04:02 PM   #4 (permalink)
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Re: Roller Rockers

I've thought about going with a set of 1.7 ratio rockers in my car in search of a little more power but have never heard that these would make other changes like push rods necessary.

What's up with that?
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Old 12-17-2007, 05:25 PM   #5 (permalink)
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Re: Roller Rockers

I got a set of 1.7 from Paul and I have not put them to use yet. I am will pleased with the way they are made and if you read the info about them you wil have a better understanding of roller rockers. They are a good deal.

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Old 12-18-2007, 03:18 AM   #6 (permalink)
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Re: Roller Rockers

I am sure they are good as all the over rockers out there
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Old 12-18-2007, 11:09 AM   #7 (permalink)
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Re: Roller Rockers

I've read all the info on them and I think they look really good and strong, and am considering them for my 289 to replace the Crane Energizers (cast aluminum). However I'm curious as to how their weight compares to other aftermarket rockers... they look pretty thick on top, which is a good thing for strength, but bad for valvetrain mass and valve float at high RPM. How does their weight compare to say a Harland Sharp, Crane, Scorpion, Ford Motorsport, or any other billet aluminum rocker?
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Old 12-18-2007, 11:46 AM   #8 (permalink)
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Re: Roller Rockers

All this talk, I'm going to go install mine now.
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Old 12-18-2007, 01:58 PM   #9 (permalink)
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Re: Roller Rockers

Quote:
Originally Posted by 65FalconLover View Post
I've thought about going with a set of 1.7 ratio rockers in my car in search of a little more power but have never heard that these would make other changes like push rods necessary.

What's up with that?
The need for different length pushrods has nothing to do with rocker ratio, per se. The point about different length pushrods (brought up in a post above) is actually typical of switching from one brand or type of rocker arm to different one. This is because most all aftermarket rocker arm manufacturers have designs that may differ from the competition...or even from the oem rocker arm design(s). And in order to set up proper rocker arm geometry, one of the adjustments in the valve train can be pushrod length.

Assuming that you have established proper valve train geometry with a set of Miller SBF 1.6 ratio rockers, switching to 1.7 ratio Miller SBF rockers will not dictate the need for new pushrods; the valve train geometery will remain well in the ballpark...unless you are really, truly splitting hairs and ordering custom length pustrhods so as to be within .010" or soemthing crazy like that. (Most pushrods are available on .050" increments, and so in the example noted here the same pushrods would likely be used with both sets of rockers.

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Old 12-18-2007, 02:09 PM   #10 (permalink)
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Re: Roller Rockers

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Originally Posted by Motorhead View Post
I've read all the info on them and I think they look really good and strong, and am considering them for my 289 to replace the Crane Energizers (cast aluminum).

I'm curious as to how their weight compares to other aftermarket rockers... they look pretty thick on top, which is a good thing for strength, but bad for valvetrain mass and valve float at high RPM. How does their weight compare to say a Harland Sharp, Crane, Scorpion, Ford Motorsport, or any other billet aluminum rocker?
If you study these rocker arms while holding them in your hand, you will notice that they have material where it is needed the most...such as around the trunnion...and minimal material where it is not needed as much...such as over the roller tip. So as far as whether or not they might be "bad for valvetrain mass and valve float at high RPM," the answer is that there is, in fact, not a lot of material directly over the valve tip and valve spring and so there is not a lot of mass moment of inertia, which is what you are technically referring to.

As far as comparing them to the above noted rocker brands, I'd say they are way better than some of those that you mentioned, and just as good as some of those that you mentinoed yet the Miller's are priced lower than the equal quality/performing rockers. BTW, not trying to sound so much like a salesman but rather offering my honest opinion based on rocker arm designs that I have seen over the years.

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Last edited by paulkane; 12-18-2007 at 02:14 PM.
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Old 12-18-2007, 02:33 PM   #11 (permalink)
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Re: Roller Rockers

forget overall rocker arm weight, the weight over the nose is what you need to be concerned with.
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Old 12-18-2007, 04:08 PM   #12 (permalink)
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Re: Roller Rockers

First of all I think the Millers sound like an awesome deal, and whenever I do have the money to upgrade in the future, I'm 95% sure it'll be a set of either 1.6 or 1.7 ratio Millers (the other 5% is for if they are no longer available at the great price they are offered at now).

While overall rocker arm weight is not the best indicator of actual rocker inertia, as you guys are pointing out, the fact is that every part of the rocker that rotates contributes to it's moment of inertia. The parts that are further out from the rotational centerline, like the roller tip and the pushrod cup area, contribute the most... but all the rotating material contributes to the overall inertia.

Since it would be pretty difficult to compare the actual rotational inertia of all the different rockers, the next best thing would be to just compare their actual mass of moving parts (everything but the clips and trunion), and take a good look at where the mass appears to lie on the rocker body. On the Millers, they have a lot of material above the centerline of the roller tip, on the upper portion of the rocker body, which is the farthest out portion of the body from the rotational centerline, so that's why I brought the question up.

However, I'm still relatively new at this, and don't know how significant the rocker inertia is compared to the valve, spring, retainer, pushrod, and lifter. It would be nice to know how all those masses compare on a typical SBF. But if you guys say the difference is insignificant, then I'll take your word for it.
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Old 12-18-2007, 04:46 PM   #13 (permalink)
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Re: Roller Rockers

Quote:
Originally Posted by Motorhead View Post
First of all I think the Millers sound like an awesome deal, and whenever I do have the money to upgrade in the future, I'm 95% sure it'll be a set of either 1.6 or 1.7 ratio Millers (the other 5% is for if they are no longer available at the great price they are offered at now).

While overall rocker arm weight is not the best indicator of actual rocker inertia, as you guys are pointing out, the fact is that every part of the rocker that rotates contributes to it's moment of inertia. The parts that are further out from the rotational centerline, like the roller tip and the pushrod cup area, contribute the most... but all the rotating material contributes to the overall inertia.

Since it would be pretty difficult to compare the actual rotational inertia of all the different rockers, the next best thing would be to just compare their actual mass of moving parts (everything but the clips and trunion), and take a good look at where the mass appears to lie on the rocker body. On the Millers, they have a lot of material above the centerline of the roller tip, on the upper portion of the rocker body, which is the farthest out portion of the body from the rotational centerline, so that's why I brought the question up.

However, I'm still relatively new at this, and don't know how significant the rocker inertia is compared to the valve, spring, retainer, pushrod, and lifter. It would be nice to know how all those masses compare on a typical SBF. But if you guys say the difference is insignificant, then I'll take your word for it.
On a typical street oriented hyd set-up the weight isn't extreamly critical. Althought lighter stuff will help, its more applicable to higher rpm stuff
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Old 12-18-2007, 05:55 PM   #14 (permalink)
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Re: Roller Rockers

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Originally Posted by dfree383 View Post
On a typical street oriented hyd set-up the weight isn't extreamly critical. Althought lighter stuff will help, its more applicable to higher rpm stuff
Well, that was my whole point, I'm running a solid lifter flat tappet cam and turning it over 7000rpm.
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Old 12-18-2007, 06:32 PM   #15 (permalink)
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Re: Roller Rockers

Quote:
Originally Posted by Motorhead View Post
Well, that was my whole point, I'm running a solid lifter flat tappet cam and turning it over 7000rpm.
For how long. If I was running 9to12k for several hours at a time I might worry about it.
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