I am tearing down my 56 292 Motor to rebuild it. When I pulled the Motor  5 Years ago to re-seal and Paint it I pulled the Pan. Bearings are original Standard size Ford Bearings. The Timing Chain was just about falling off so I replaced. I thought this Engine was original based on the Bottom end. When I pulled the Heads this Wek imagine my surprise It had the bigger Intake Valves used on the 57 and later Engines. Heads are ECZ-C Heads. Actually pretty clean. I don't know if the Exhaust Valve Seats were done with Inserts Yet. I don't have a compressor to take One valve apart and check. There is minimal Ridge in the Cylinders. I have been picking up Parts for the last while anticipating doing rebuild including a full Set of New Valves including the bigger Intake Valves. The Block is 1956 based on date Code and uses the 3 different lengths of Head Bolts. What are the Heads? ECZ-C application. Obviously Someone has worked on this Motor in the Past but not the Bottom end. I am just doing a stock rebuild using a Overhaul Kit sold on Ebay. Quality Parts as I used One about 10 Years ago on my last rebuild. 

  

""C" heads are 56.  Assume they came on  272 as well as   292 and 312 as that is the usual.  Early C's had the core plugs at the ends, later ones did not.

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Check the John Mummert site for lots of information on the Y-Blocks including casting numbers. http://www.ford-y-block.com/cylinderheadchart.htm



Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Thanks Paul. I would assume Someone did the Heads and installed the bigger Intake valves which is what I planned to do anyway. Have to see if the Exhaust Ones had hardened Seats installed . Be nice if they were already done.

  

239 heads and 1960-64 C0AE & C1AE heads had the smallest (1.64) intake valves. Did you measure yours to confirm that they are the largest (1.92) valves? 1955 & 56 heads, including your ECZ-C heads, had 1.78 intake valves. All Ford & Mercury Y-blocks had the same size exhaust valves. According to Ted, the exhaust side flowed well enough that it wasn't necessary to increase the valve size as the displacement increased. 

I purchased a Set of New Valves assuming I would need them. Bought the bigger Intakes and they are what is already in the Heads. Obviously Someone did the Heads before and put in bigger Valves.I am going to pull an Exhaust Valve and see if they put in hardened Seats. Save Me some Machine shop Costs.

  

I sent You a PM Paul. Let Me know? Thanks!

  

When I pulled the Engine just after I  purchased the Car 7 Years ago I replaced the Rear Main Seal because Someone else tried using wrong Seal. I tried something that a couple of People suggested. Instead of using the original type Side Seals I used "The Right Stuff"  to fill the sides and loosened the retainer a litlle so some would get under the retainer. I have to tell You it worked well. No Leaks. And that "Right Stuff" really is durable. Trying to get the Retainer off now and having a Fight to do so. It will flex but not break loose. Have to use a knife and cut away at the side Gap. Anyway I will do the same fix when I re-assemble it. NO indication of Leak at all. I have been told that many of the rear Main leaks on Y Block are NOT the Seal itself but Side Seals.. This Fix seems to work well. Here is a Picture of Seal Retainer shows how "The Right Stuff" works as a replacement for Side Seals. This would not come off after the Bolts were removed. Continued to flex and adhere until I sliced through with a sharpened Putty Knife. No way for Oil to leak past this Seal. I will do same when I re-Assemble my Project.

  

I recently installed a rear main seal kit from Prestige Thunderbird.   They supply Permatex Grey to eliminate the side seals as you have done.  I haven't run the car yet to see how it works...................

That's interesting that Someone would supply the "Right Stuff" instead of Side Seals. I really believe that most of the Leaks are NOT from the Crankshaft Seal but from the Side Seals. Not a great design in my opinion. Last Time I left the Cap a little loose to allow the Sealant to get to the mating Surface. This Time I will apply a small amount before installing the Cap to make sure the mating surfaces get sealed as an extra precaution against Leaks. I think the difference in Black and Grey is drying Time maybe?