Hi guys,

Almost too good to be true... but finally I may of found some ECZ-G heads(to fix my miss matching head problem) however looking at the photos I’m wondering if the heads have had too much shaved off them?

Can anyone throw in their opinion looking at the pics?









Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.

Happy New Year, Dennis.

In looking at your pictures, I understand what is causing you to raise the question.  Much depends on whether the heads you have are posted or not. 

Click on the link below for the information provided by Tim McMaster to determine whether your heads are posted or not . . . 
http://yblockguy.com/techtips/postedheads.html

After determining whether your heads are posted or not, you need to use a micrometer or micrometer caliper to measure the thickness of the 'pads' located on the exhaust manifold side of the heads.  The pads are located at the front and rear corners of each head and below where the exhaust ports exit the cylinder heads and adjacent to where the spark plug holes are located.  The thickness dimension of the pads between their top exterior surface and the surface that mates with the engine block deck was 1.000 inches when they were originally manufactured in the 1957 or the 1958 vehicle production year.  Subtract your thickness reading from the 1.000 dimension to determine how much your heads have been cut AND whether the two were cut equally.

Check to determine IF the pads measure the same thickness on the front and rear pads on each head.  IF the pad thicknesses vary significantly from front to rear on each head, it will indicate how they were machined OR how they were set-up by a shop that resurfaced them.  Too, IF the pad thickness is different between the two cylinder heads, you'll know that the machine shop that did the resurfacing did not cut them equally and was likely looking to simply clean them up enough to ensure that they would seal uniformly against head gaskets.

John Mummert recommends that un-posted y-block Ford heads be milled a maximum of .025 inch.  This machining dimension is recommended to prevent the cylinder head deck surface from flexing in service and causing head gasket leakage.

On his web site, John Mummert reports that posted y-block Ford heads have been milled as much as .045 inch without problems when put into service.

In rebuilding an engine for Karol Miller, Ted Eaton reported that he re-installed a set of 5752-113 heads that Karol had been running that had been milled .080 inch.
Click the link below for Ted's report of the Karol Miller engine build . . .
http://www.eatonbalancing.com/2015/05/01/unported-iron-heads-can-still-make-over-a-hp-to-the-cubic-inch/

Click the link below to see JM's cylinder head info that I've referenced above . . .
http://www.ford-y-block.com/cylinderheadchart.htm

Hope this info. helps!  Enjoy your summer!    


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

If they have been milled would that affect the mounting surface if the intake? Or are there head gaskets to make it back up?

Durham Missouri

Milling the heads and / or block will affect the intake mounting surface. There are not gaskets made to correct that.  However, modern composition gaskets are thicker than the original steel shim gaskets so assuming that you start with an engine that has not been touched since it left the factory, you can remove a total of about .030" from the heads and block without having to do anything to the intake surface, if composition gaskets are used.

If the intake will not fit with only one set of head gaskets in place, then you need to mill either the intake flange of the intake or the intake flange of the heads


Lawrenceville, GA

I have a set of ECZ-G heads that are still on the engine and I'd like to know if they are posted or not. What specifically is the difference between the large and small letters to be able to tell which is which? Also, how do you read the date code on the heads to determine the manufacture date? Thanks for your help!

BamaBob.  Click the link below for a picture of what large and small letter G head casting lettering looks like.  Consider reading the entire thread to get additional head information.  Unfortunately, I'm not able to help you on cylinder head date code info.  Ted Eaton wrote on this in the last year, I believe.

CORRECTION:  In the thread referenced below, Ted explained how to read the cylinder head date code and gave examples.  Ted's info is on the 2nd page of the thread referenced.

http://forums.y-blocksforever.com/FindPost113735.aspx

Hope this helps.  


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

Measure the pads on the sparkplug side of the head.  From deck to top of pad.  Scrape off any paint.   They are ~1.010" from the factory, and if they are less, you will know just how much they have been milled.  Joe-JDC

JDC

Thanks Charlie, and Happy new year to you too.

How about that... first bit of knowledge learnt for 2018. This forum always seems to deliver the good oil.😁

I’m just waiting to hear back from the seller now with the measurements- hopefully the heads are within the tolerated measurement. I’ll let you know how I go.


Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.

As I recall the un-milled heads will have pads about 1" thick. Those look like a pretty heavy cut. You can see they milled into the port area quite a bit.

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

Just had a chat to the owner of the heads and he said they measure 0.955-0.960 inch. So that would equal roughly worst case 0.40. He also said they are not posted😩.

What do you guys think? Too risky, or would you think they might be ok for an engine that only gets used a dozen times a year? (Providing the surfaces are all even and square)


Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.