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Re: crane roller rocker's?
Originally Posted by US1 Fountain
2 of the rockers will need to have the corners ground down for clearance for the V/C hold down bolt bosses. Even Merc does that from the factory.
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Re: crane roller rocker's?
Originally Posted by Whiteknuckle
I agree with mcollinstn. You will not see any performance gain. You will most likely have to change rocker arm studs also to accomadate a roller rocker. And yes you will have clearance problems with roller rockers in a stock valve cover if you don't grind or shim up with gaskets. And if you are changing to rollers, I would want to go with a 3/8 pushrod instead of the 5/16 that you have in there now. I would also look at twisting that engine up some from 4500RPM. 4800-5000 RPM is fine for that engine. They are better than most people think.
Thank's for the input! That is my goal getting them up around 4800-5000rpm I was looking for some easy bolt on power. I dont want to go back inside the engines. |
Re: crane roller rocker's?
Another option to avoid the valve cover hassles. I had a set of Comp Cams steel roller rockers I wasn't using so I put them on the intakes and had to do no grinding.
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Re: crane roller rocker's?
stock rocker usually aren't the 1.7 to 1 ratio they should be. when you go to a set of good a'mkt roller rockers you get better valve timing accuracy, durabilty and a lot of reliabilty over the stock suff. it gets even more important when you run a lot of spring pressure for hi po cams. a lot of the valves covers have oil drippers over the pivot point to try to lube the the stamped steel ones. roller rockers live long happy lives with minimal oil. you can also get a set of 1.75 to 1 ratios for intake and run 1.7's for exhaust or vice versa if your running a blower with heads that don't have good flowing exhaust ports. i say step up for the reliabilty alone and get all the other benifits for free,,, ratman
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Re: crane roller rocker's?
Ratman,
The question is, if he were to put the rollers on an otherwise stock engine. We all know the benefits if you are running a modified engine with differnent cam and other modifications. |
Re: crane roller rocker's?
correct valve timing will help any engine. his stocker would im sure benifit from an addl .05 rocker ratio for a better cylinder fill. wouldn't you agree? also any engine will benifit from less friction in the rocker fulcrum area, as well as much improved reliabilty.
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Re: crane roller rocker's?
I think the key word here in his original post was "noticeable". How much HP at best would rockers alone make and how much does it take to be noticeable when you already have 700 HP?
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Re: crane roller rocker's?
I guarantee that if you take a stock 330 HP 454 and change from the stock stamped rockers to roller rocker arms you will not notice a difference in performance. What I am saying is, it is not effective cost wise. If the engine is only turning 4500 RPM he needs to either tune it up if its in good shape, or make the changes in prop necessary to get it spinning to at least 4800 RPM. That would be cost effective. Do some head modifications, camshaft changes then you can worry about rocker arms.
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Re: crane roller rocker's?
Originally Posted by Whiteknuckle
I guarantee that if you take a stock 330 HP 454 and change from the stock stamped rockers to roller rocker arms you will not notice a difference in performance. What I am saying is, it is not effective cost wise. If the engine is only turning 4500 RPM he needs to either tune it up if its in good shape, or make the changes in prop necessary to get it spinning to at least 4800 RPM. That would be cost effective. Do some head modifications, camshaft changes then you can worry about rocker arms.
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