80 over rebuild
 

Anybody out there know where i can get pistons & rings for a 57 312 t bird 80 over.

Re: 80 over rebuild
 

Egge Machine

https://egge.com/part/egg-1000-l2018-8/

Re: 80 over rebuild
 

just wondering what size is your engine now.

Re: 80 over rebuild
 

312

Re: 80 over rebuild
 

I'm guessing darrell was asking if it's been bored oversize already.
...because they usually aren't bored more than needed to clean up the cyl wall surface.

Re: 80 over rebuild
 

Don't know where I saw it, but it's been my understanding for the past many decades that 60 is the maximum overbore size for a Y-block. Beyond that exposes the cylinder wall to danger of busting through to the water jacket.

Re: 80 over rebuild
 

The machine shop I've been using here inspected an extra 312 block I've got, it's already 60 over. The head machinist/owner did some extra looking and finally found an 80 over set of pistons & rings and said he'd be comfortable rebuilding it at that size.
It's an EDB-E with a January '58 date code if that makes a difference.
Some years of blocks may tolerate that amount of over-bore better than others, I don't know.
.

Re: 80 over rebuild
 

the early blocks suffered less from core shift.

Re: 80 over rebuild
 

Huh? :confused:

Re: 80 over rebuild
 

Thicker and heavier castings. Old school.

Re: 80 over rebuild
 

checking between the cylinders the old blocks were more even.less cylinder stagger.the later c1 and c2ae blocks were a lot worse.

Re: 80 over rebuild
 

My "Huh?" response was to a spam post in what appeared to Russian. The moderator must have removed it. I understand about bore limits and core shift.

Re: 80 over rebuild
 

Then that explains it ... :rolleyes:

Re: 80 over rebuild
 

i always wonder about the thickness of walls bought a ultrasonic tester you will be done wondering about the block and learn alot

Re: 80 over rebuild
 

Sonic testing is the best way to proceed.

FYI, regarding racing applications, John or Geoff Mummert and Joe Crain, don't recommend boring a 312 block, more than .040. It's been said that the cylinder cores are the same on on the 292 & 312. I'm not a Y-block guy so, I have no experience with them, but, Geoff & Joe, have a lot of experience with them. There is one more that can be consulted, Ted Eaton:

https://www.eatonbalancing.com/2000/...cing-articles/

Any of those 4 people, can tell you what is what, on a Y-block, it's how they make there living.

Re: 80 over rebuild
 

The CASTINGS are the same but each receives differing machining protocol, the 312 being much less accurate. The trick is to find a 292 block and build it to 312 spec., especially if HP.

Re: 80 over rebuild
 

I think somebody has been drinking some of that corn.

Re: 80 over rebuild
 

Would you care to elaborate or even just reply in a somewhat knowledgeable manner?

Re: 80 over rebuild
 

Guess not ...

Let's look at this again. You somehow think my statement above about the Y-BLOCK 292/312 CASTING is not correct?

If I am wrong, I am wrong. But bring facts, not potshots.

Now, can you provide anything substantial to the contrary or will I be forced to post new SEX JOKES that seem to disturb you so badly ... :D

Re: 80 over rebuild
 

I guess 'ol blacktie got held up yesterday in worship and bible class. Those terrible sex jokes he stumbled across here must have really worn him down.

Any who, for any other doubters -

SOURCE - http://www.ford-y-block.com/Block%20identification.htm