why stainless steel rocker arms?
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Steel rockers tend to be recommended for serious valve spring pressure where in open pressures are 800lbs and beyond .. I've ran crower on shaft set ups the went back to jesels for offsets at the push rod tip . Just strength for steel and stainless .. Trunion is still another conversation and most mfg will rebuild your rockers
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I would think it's just an option for corrosion resistance. Under the valve covers is where you'll find any condensation, whether it's from a little reversion, or just a cold block and not enough oil temp. This time of year, every engine I dyno ends up with a little milky oil under the breathers, and bottom of the fill plug just from the air temp.
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this would be a good question for a metallurgist. is it possible that it has to do with elasticity or some such thing? I would think that the metal used would need to have a minute amount of give in it vrs something super hard that would tend to crack over time.