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.
 
Daves55Sedan said:
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.
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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.
.
 
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checking between the cylinders the old blocks were more even.less cylinder stagger.the later c1 and c2ae blocks were a lot worse.
 
i always wonder about the thickness of walls bought a ultrasonic tester you will be done wondering about the block and learn alot
 
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/2000/03/24/quick-index-for-eaton-balancing-articles/

Any of those 4 people, can tell you what is what, on a Y-block, it's how they make there living.
 
It's been said that the cylinder cores are the same on on the 292 & 312.
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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.
 
55blacktie said:
I think somebody has been drinking some of that corn.
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KULTULZ said:
Would you care to elaborate or even just reply in a somewhat knowledgeable manner?
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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
 
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