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By famdoc3 - 5 Years Ago
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Have 15 good ones and 1 1.43 replacement. Am currently rebuilding my shafts Fo my 471 blower motor. Thanks for the help. MIKE
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By famdoc3 - 5 Years Ago
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How about it guys I need 1 good 1.5 rocker. MIKE
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By Ted - 5 Years Ago
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Mike. I have a five gallon bucket of Y rockers. You’re welcome to go through them and pick one out.
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By KULTULZ - 5 Years Ago
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Wanted - 6564 A2 Rocker Arm
CASTING ID ECG-6564-A2 - ?
Which style of adjust nut -
Maybe this will help someone find a spare one in their shop.
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By famdoc3 - 5 Years Ago
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Thanks for the offer Ted but your a 2000 mile trip. Love to come to your shop sometime but for now just need the U.S. Mail to do the job. Kultulz thanks the picture is just right. Am replacing the adjusters so don't care which. Many thanks! MIKE
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By Tedster - 5 Years Ago
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No man, let's everybody plan a road trip to Ted's! I bet he has all kinds of cool stuff!!
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By Lord Gaga - 5 Years Ago
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The adjusters don't interchange Mike.famdoc3 (11/23/2019)
Thanks for the offer Ted but your a 2000 mile trip. Love to come to your shop sometime but for now just need the U.S. Mail to do the job. Kultulz thanks the picture is just right. Am replacing the adjusters so don't care which. Many thanks! MIKE
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By Ted - 5 Years Ago
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famdoc3 (11/23/2019)
Thanks for the offer Ted but your a 2000 mile trip. Love to come to your shop sometime but for now just need the U.S. Mail to do the job. ..
Mike. Sorry about that. I had you mistaken for a Y-Blocker that’s about thirty five miles away.
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By BamaBob - 5 Years Ago
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There's one for sale on EBay. Item number 300999449386. Casting number EAN 6564 B.
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By KULTULZ - 5 Years Ago
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There's one for sale on EBay. Item number 300999449386. Casting number EAN 6564 B.
Wrong ratio -
JOHN MUMMERT
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By Tedster - 5 Years Ago
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I thought EAN prefix meant 1.4 ratio rockers?
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By BamaBob - 5 Years Ago
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Shows what I know! I just assumed the 6564 number covered all high ratio rockers
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By KULTULZ - 5 Years Ago
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You're OK, just trying to help ... 
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By Ted - 5 Years Ago
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famdoc3 (11/16/2019)
Have 15 good ones and 1 1.43 replacement. Am currently rebuilding my shafts Fo my 471 blower motor. Thanks for the help. MIKE
I’ve got someone local that has extra NOS rockers and wants to send you one. Do you have the friction style or the locking nut style? Send me your mailing address and I’ll forward that information to that person so they can mail a rocker to you. My email address is located under ‘Contact Us’ at www.eatonbalancing.com .
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By KULTULZ - 5 Years Ago
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EAN is an Assembly/Engineering/Service PN Prefix.
It identifies when it was first used and when/where used with proper cataloging.
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By paul2748 - 5 Years Ago
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EAN rockers are 1.43 ratio rockers. The ECG rockers are the 1.54, either lock nut (A2) or interference (B-2)
Tedster (11/24/2019)
I thought EAN prefix meant 1.4 ratio rockers?
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By famdoc3 - 5 Years Ago
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So the saga continues. With Ted's help another member of this site was generous enough to try to send me the rocker arm I need only to be foiled by the ineptitude of our U.S Pistal Service. Yes the envelope arrived tracking number and all but EMPTY! The shipping envelope had opened in transport and they delivered an empty envelope! Maybe this is just not meant to be. Mike
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By KULTULZ - 5 Years Ago
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EAN rockers are 1.43 ratio rockers. The ECG rockers are the 1.54, either lock nut (A2) or interference (B-2)
Someone who actually has an ECG-6564-A2 rocker arm needs to measure the OL and drill bit size as described by Ted to nail this down. I think A2 is going to be 1.43 while the B2 is 1.54.
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By paul2748 - 5 Years Ago
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If that's the case, then the article in Y Block Magazine is wrong. The later 1.43 rockers (after 58 I guess) started with or had 575
KULTULZ (12/6/2019)
EAN rockers are 1.43 ratio rockers. The ECG rockers are the 1.54, either lock nut (A2) or interference (B-2)
Someone who actually has an ECG-6564-A2 rocker arm needs to measure the OL and drill bit size as described by Ted to nail this down. I think A2 is going to be 1.43 while the B2 is 1.54.
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By KULTULZ - 5 Years Ago
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If that's the case, then the article in Y Block Magazine is wrong. The later 1.43 rockers (after 58 I guess) started with or had 575
I am not privy to the magazine and cannot read that tech article.
What I am going by is that during the 1956 production run, a lot of modifying was done on the valve-train. It seems to be around when FORD put the 312 in the PASS CAR. One was the change in rocker arm ratio and adjustment screw design.
Going by SERVICE PN only in the period MPC and chassis catalogs, the first PN was B6A 6564-A and the later B6A 6564-C. The MPC also shows the B6A-A was the service replacement for the 54/55 EAN which is 1.43. The late 56 and 57 engine had the 1.54 ratio and the ratio went back to 1.43 in 1958.
The seven numeric character you see on the later arms are part of a PN System used briefly 1958/59. The Service PN was changed again in 1960 (C0AZ 6564-A) which was a 1.43 retro-fit for all FYB.
Without the SERVICE BULLETINS and PRODUCTION LETTERS of the period most info is incomplete and/or conjecture. This is also why one engine will have a multi-use of rocker designs on it.
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By Hoosier Hurricane - 5 Years Ago
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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.
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By KULTULZ - 5 Years Ago
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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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By famdoc3 - 5 Years Ago
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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
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By Cliff - 5 Years Ago
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Check out these
https://www.ebay.com/itm/264559710542
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By KULTULZ - 5 Years Ago
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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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By KULTULZ - 5 Years Ago
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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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By KULTULZ - 5 Years Ago
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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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By famdoc3 - 5 Years Ago
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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
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By KULTULZ - 5 Years Ago
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From thread - http://forums.y-blocksforever.com/Topic14883-2.aspx
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By Ted - 5 Years Ago
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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.
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By charliemccraney - 5 Years Ago
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Looks like they can be spotted by the difference in the length of the pushrod oiling hole material.
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By Hoosier Hurricane - 5 Years Ago
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Kultulz, I checked a B-2 rocker, again a random pick from my pile. The OAL is 2.960, and the same 15/64 drill fit. They had no screws, I put self locking screws in them to check the drill bit clearance. Mike, did you find an A-2 rocker to complete your set?
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By KULTULZ - 5 Years Ago
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HOOSIER HURRICANE Posted-
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 checked a B-2 rocker, again a random pick from my pile. The OAL is 2.960, and the same 15/64 drill fit.
... hmmph ...
Now it is becoming confusing ...
THANX for your time and trouble ...
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By famdoc3 - 5 Years Ago
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No haven't completed my A2 set but do have a B2 set so maybe ok now. Thanks MIKE
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By Ted - 5 Years Ago
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famdoc3 (11/16/2019)
Have 15 good ones and 1 1.43 replacement. Am currently rebuilding my shafts Fo my 471 blower motor. Thanks for the help. MIKE
The person that sent you that rocker that ended up being missing due to a torn package gave to me the remainder of his oem stash of Y parts. There are still some random NOS 1.54:1 ‘A2’ rockers remaining but none of them have the adjusters or lock nuts in them. If you still need one less the adjuster and nut, let me know and I’ll get it into the mail for you. I will need your mailing information again and you can send that to my email address. That can be found at www.eatonbalancing.com .
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By famdoc3 - 5 Years Ago
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My rocker arm came today. Ted thanks for coming through. Now I have the 16!
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