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Hoosier Hurricane
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Kultulz, I picked a random A-2 rocker arm out of my stash. The OAL length is 2.950" and a 15/64" drill bit is a tight fit between the rocker body and the ball on the adjuster screw. I guess I should have compared it to a B-2, wasn't thinking.
John - "The Hoosier Hurricane"
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KULTULZ
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Kultulz, I picked a random A-2 rocker arm out of my stash. The OAL length is 2.950" and a 15/64" drill bit is a tight fit between the rocker body and the ball on the adjuster screw. I guess I should have compared it to a B-2, wasn't thinking.
I really appreciate that!
Do you have a B2 arm to compare? Can you lay them A2 top and B2 bottom to photo to make a eye comparison? Was the adj screw two piece? If you have a B2, two piece or one piece? The change(s) may have been gradual.
Rocker Arm- Casting ID No _3 - ECG-6564-B2 - 5751066
I believe this comparison photo is TED's.
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famdoc3
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I have a number of rockers simply marked " made in USA" on one side and a letter on the other with interference type adjusters that measure .250 on the adjuster side. No Ford script, no part numbers that appear to be high ratio by our measuring standard (.250) and later model by our interference adjuster. Is anyone aware of high ratio after market rocker arms?? This has become progressively more intriguing and my A2s are 1.43s by the .320 or so measurement by me. So I I fact seem to have all the 1.53s I need! Who knew??? MIKE
Mike, still lovin his 57 t'bird after 53 years!
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Cliff
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KULTULZ
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Here is a post excerpt I saved some time ago. I believe it was TED EATON who posted it. I usually source them but I seemed to have not on this one - ... we have been led to believe ECG 6564-A2 rockers were all 1.54 ratio. Usually they are, but as Ted points out & also John Mummert in an article in issue # 83 of YBM, a few aren't. According to John, another way to confirm the difference on the similarly marked rockers, is to note that the 1.54 s have a small 3-digit number near the adjusting screw. The 1.43 impostors have a single digit number. Just another nuance to try and remember.
Also, I believe the numbers being referred to are CASTING MOLD ID NOS.
Rocker Arm Comparison - 5751066 @ TOP - ECG-6564-B2 @ BOTTOM
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KULTULZ
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...hmmph...
Notice the INSTR read 1954-1955 and for use on intakes only. Could have been released in 1955.
NOTE TO SELF - huKt oN fONIx - Wurx 4 mEE
Text reads if used on intake only -
FORD racing teams of that era must have known the quality problems and had to use performance rockers.
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KULTULZ
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famdoc Posted On Another Thread - http://forums.y-blocksforever.com/Topic149385.aspx The saga continues: you know those old guys you used to know? The ones that always had great stuff stashed that they never remember? As I was measuring and trying to figure out the rocker arm question didn't I find a sealed ziplock bag with 16 ECG 6465 B2 NOS. The adjuster side won't pass a 1/ 4 inch drill but the overall length I just under 3.00". The aftermarket are between 3.20 or so. I am progressively more confused but wonder how anyone really knows what ratio they have given the overall variations I see in the 84 different ones I'm looking at especially the old ones and the aftermarket ones that are out there. Is anyone trying to measure the actual effective ration an if so how are they doing it? MIKE
THANX MIKE!
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famdoc3
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Does everyone remember the old guy that always had cool stuff stashed he would suddenly "find"? While I have been measuring and getting progressively confused by the variations I find didn't I find a ziplock bar of 16 NOS ECG 6465 B2 rockers?. Their overall length is about 2.90 as opposed to some of the aftermarket ones that average around 3.20. Is anyone measuring the effective ratio of their rockers and how? This has gotten more and more confusing to me with the variations of demensions even within sets that are clearly from the same batches by number and wear. The NOS B2s seem to be all demensionally the same
Mike, still lovin his 57 t'bird after 53 years!
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KULTULZ
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Ted
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famdoc3 (12/7/2019)
The saga continues: you know those old guys you used to know? The ones that always had great stuff stashed that they never remember? As I was measuring and trying to figure out the rocker arm question didn't I find a sealed ziplock bag with 16 ECG 6465 B2 NOS. The adjuster side won't pass a 1/ 4 inch drill but the overall length I just under 3.00". The aftermarket are between 3.20 or so. I am progressively more confused but wonder how anyone really knows what ratio they have given the overall variations I see in the 84 different ones I'm looking at especially the old ones and the aftermarket ones that are out there. Is anyone trying to measure the actual effective ration an if so how are they doing it? MIKE My quick and dirty for identifying the 1.54:1 rocker arms is just look for the ‘ECG’ on the rocker. The overall measurement of the rocker also works as 3” or less is 1.54 and over 3” is 1.43:1. The drill bit test where you measure the distance between the rocker body and the adjuster also works. Beyond all that, I have a home made checker with a pair of dial indicators that I use to accurately measure the actual rocker ratio. The ratio does vary depending upon where the adjuster screw is located within the threads.
  Lorena, Texas (South of Waco)
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