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How much horse power will roller rocker arms add to a 350 small block chevy?
I have stamped steel arms on there now and i was wondering how much power i would gain
Are you looking at rocker arms with just roller tips, or ones with a pivot on the rocker arm stud as well. With stock valve spring pressure, stock camshaft profile, and a factory rev limit you aren't going to see or feel any difference. Your rocker arm studs are likely pressed in and the pushrods are factory as well as the rocker ratio. Where people may see a horsepower increase is when they go from 1.5 ratio rocker arms to 1.6. Which gives them a bit more flow on the exhaust and intake because of the higher valve lift. Don't get carried away with this or you'll kiss a piston with a valve, especially if you lose control of your valvetrain at high rpms or insufficient spring pressure.
While most people talk about the benefits of friction reduction with roller rockers, the whole point of roller rockers was to allow the rocker arm tip to slide across the valve stem at high lift. Once you get a high camshaft profile, with high lift the valve train geometry means that the rocker arm contact point move quite a bit horizontally on valve stem. With a sliding contact rocker arm this is a lot of side force on the valve stem, enough to break it. With a roller tip rocker, there is much less side loading.
Honestly if you have stamped rockers on the engine now and want to replace them with cheap roller rockers you are basically adding much more complexity to the valve train with no performance increase. Some of the cheap roller rockers have poor build quality and bearing failures. With stamped rockers and guide plates you are good to go on a stock engine.
Now if you are putting in a larger cam you should get better valve springs, and possibly roller rockers with threaded rocker arm studs of a larger than stock size. You can even up the rocker ratio a bit.
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