Brent.  Haven't forgotten you on the decoding topic.  Still reading in the Forum Archive.

Different topic dealing with '55 heads.  Ran into this in the Forum Archive.  Click the link below started by Ted.
http://forums.y-blocksforever.com/FindPost129359.aspx


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

Charlie,

The ECK-B engine that I purchased has two different heads.[ http://forums.y-blocksforever.com/Topic140773.aspx ] I'm concerned that if I buy an ECK-C to match the weird ECK-C that I have it may cause an unbalance.


Got these ECZ-G heads back today. I think this is a good example of milled heads. One pad measures .976" and what appears to be milling indicators are gone in that area. Looking at the coding, they appear to be matching heads 










.150 Stroked Y-Block:327.25 ci @ >1hp per ci
 

Brent.  There is an amazing amount of discussion about ECZ-G cylinder heads in the Forum Archives.  From early times, ECZ-G heads were sought after for improved y-block engine performance.  The big intake valves and the small combustion chambers with the advertised compression ratio of 9.7:1 on the D code 1957 Fords and Merc 312 engine applications made them sought after.  

As you get into this stuff, you learn that there are three (3) species of ECZ-G cylinder heads.  In short, there are 'posted' and 'un-posted' ECZ-G heads with larger casting letters and 'un-posted' ECZ-G heads that have smaller casting letters.  The differences in the three species are significant.

The four links below provide pretty complete coverage of information you might be interested in.  There is some overlap in the info, but by reading all of the entries, you'll get a good handle on the nuances.

http://www.yblockguy.com/techtips/postedheads.html

http://forums.y-blocksforever.com/Topic113734-1.aspx

http://forums.y-blocksforever.com/Topic128650-1.aspx

http://forums.y-blocksforever.com/Topic125750.aspx?Keywords=G+heads#bm125752 


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

One more head oddity. This is a picture of a 113 head CC. Notice the dimple between the valves (all 4 CCs have it). Do you suppose this is forged that way or someone's experiment, definitely goes against the smooth chamber theory.






.150 Stroked Y-Block:327.25 ci @ >1hp per ci
 

Brent.  I have no info on the dimples in the 5752 / 113 combustion chambers.  All the 113s I've seen have the dimples.  Notice how there seems to be less shrouding of the intake and exhaust valves in the 113 chambers than what you see in the ECZ-G  chambers.  In my last entry I mentioned how historically y-blockers', including myself, thought the G heads used on '57 Fords and '58 Mercs were THE thing to have on their build.  Today, I'd rather have a set of 113s!

Yes!  The G heads have smaller combustion chambers offering a higher static compression ratio, BUT the 113s, as cast, have less valve shrouding and ALL 113s are posted!  Need a smaller combustion chamber to accomplish a higher static compression ratio?  Have the machine shop mill the heads!

The link below details a very street-able build that Ted Eaton did on a 292 block for Karol Miller.  Ted used a .070 overbore (yielding a 3.820 bore) on a 292 block, a stock 3.3 stroke, 113 heads, '56 Ford 1.54:1 rocker arms, flat top pistons, and a custom Isky grind camshaft with a dual pattern grind using a 110 degree lobe center angle.  End result?  303 cubic inches producing a peak of 315 horsepower, and 335 ft. lbs. of torque @ 3,300 rpm!  This shakes out to just over 1 horsepower per cubic inch of engine displacement!  Substitute a 312 crank and connecting rods and the hp and torque numbers will go up with the ~317 cubic inches of displacement.

http://www.eatonbalancing.com/2015/05/01/unported-iron-heads-can-still-make-over-a-hp-to-the-cubic-inch/  


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

Ted's recipe for hp is inspiring. Waiting to hear the CITE will be the block. I have the 312 crankshaft wet tested and ready to go. Regarding the 113s all having dimples. I guess the oddity is the three I have without dimples. We will use 113s and  a 218 @ 50 111 cam, some head work and hopefully a 350hp, 317ci - C4 w/2000 stall - 3.31 Dana 44 gears and my bird is back on the road in style after a long 32 year hiatus.

THANKS to everyone for sharing your knowledge!...






.150 Stroked Y-Block:327.25 ci @ >1hp per ci
 

Brent.  You may have read in the Archive or on JM's web site that 113 heads were supplied as replacement heads over-the-counter by Ford after the G heads went out of production.  I've seen several sets of 113s that came off of marine engine applications.  I think I recall Ted indicating that y-blocks were used by some boat manufacturers longer than they were used in production cars and trucks.  I'm not positive of that, but we're talking into the early '60s anyway.  The dimples in the 113 combustion chambers may indicate a production change to the later castings.  My 113 heads have the large S in the rocker arm area that John speaks to in the insert below.

From John's web site page on cylinder head applications

Heads with large "S" in between center exhaust valves are service replacement heads as date codes are after production run.  5752-113 was sold as replacement head for ECZ-G

Going back to installing a 312 crank in your 292 engine build.  Somewhere in the Forum Archive is info detailing the 312 crank modifications required to accomplish the swap into the 292.  The short of that is 
-  the 312 crankshaft main bearing surfaces, rear slinger dimension, and rear seal dimension need to be reduced to 292 dimensions by a competent auto machine shop.  Crank main journal radius-es are critical to maintaining crank integrity and strength. 

The link below is to John Mummert's web site and shows the machining dimensions required
http://www.ford-y-block.com/crankshaftid.htm

Hope this helps!  


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York

Hello Brent   Sent you a E-mail.  Bill  Oregon

Bill,

I did not get your email. Please try again, I updated info.



.150 Stroked Y-Block:327.25 ci @ >1hp per ci
 

Hello   Resent E-mail.  Bill  Oregon