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By Rudder2fly - 14 Years Ago
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I have several rocker arms Part #EAA 6564-B. What ratio are they? Thanks G.S.
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By Rudder2fly - 14 Years Ago
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Bringing this post back to see if someone out there can help identify the ratio of this rocker arm? Thanks G.S.
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By easyissy - 14 Years Ago
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Those are 1.54:1. Check John Mummert's site for more info. http://www.ford-y-block.com/rockerarm.htm
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By Rudder2fly - 14 Years Ago
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Since I am still not sure of the ratio, I will ask the forum this; Are ECG and EAA the same 1.54 ratio?
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By Teros292 - 14 Years Ago
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Part # EAA-6564-B shows in my partsbook that it is for 55/56 223 6 cylinder engine. No ratio mentioned there.
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By Rudder2fly - 14 Years Ago
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Thank You TERO. G.S.
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By Y block Billy - 14 Years Ago
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One easy way to tell high ratio from low ratio is if you look at the oil hole channel with the rocker upside down, you will notice the casting of the channel on high ratio is about 1/8" long and on the low ratio it is about 1/4" long. I have pictures describing this somewhere but can't find them at the moment.
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