A little history about what I have and want to do: I've got a 272 that I'd like to bore out at least to .030 or .060 over the size of a 292, add a ground 312 crank with new rods and pistons. Final bore is going to be close to 3.810.



Now I know that the bores are different between the 272 and 292. The 272 is bored to 3.62 and the 292 has a larger bore of 3.75. Otherwise the stroke is the same- so, same crank, journals and what not. Is there any difference between the two blocks other than bore? I'd like to know if the 272 is the same block as the 292, and can handle the same over bore work that a 292 gets when it's bored and stroked out.



I've got a machine shop that's going to sonic the walls, to determine if it was offset ground from the factory and can handle the .130 to .140 over a stock 272 bore. I'm sure all of the supreme beings have seen this question before, but I'm still a small little pleb. Thanks for the help guys.

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie

My first impression is why not start out with a 292 block in the first place. There are plenty of them around and then you will have plenty of wall thickness in case you want to get more radical with cam and carburetion.

Kenneth

Fredricksburg, Texas

I'm definitely not opposed to using a 292, but I kind of like the idea of using the engine it was born with. Maybe that's a little wierd, but, I think it's kinda cool.



But, back to the point. There is a differnce in the two blocks then?

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie

Grovedawg



I just went through all this with my 272. My engine rebuilder, whom I trust, sonic tested my block and suggest we only go 30 over...about to a 283. Yes, we could have gone bigger but he said he could give me more hp. by doing things to the engine...porting, better cam, improving rockers, improving oiling..improving valves and seats etc.



He suggested it was not economical to go to bigger pistons, larger bore etc. He had no problems getting all the parts he needed shipped next day for my 272.



Good luck.



Gt




Gordie T           Long Point, Ontario

If it's feasible my intention is to take the 272 to at least a 292 bore. Or a little more. And stroke it with a 312 crank.

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie

Sonic testing will tell you up front if your 272 block is a candidate for boring out as far as you’re contemplating.  Offset boring is a option if the block has core shift that would otherwise stop you from boring the block heavily if just centering up on the existing bores.  Most 272’s will bore out to a standard bore 292 but there are a few with significant core shift which is why you sonic test to begin with.  Going the extra amount of bore over a standard 292 will be a challenge and still have enough material remaining that you’re comfortable with what you have.  Sonic testing in this case eliminates any and all guess work.

Lorena, Texas (South of Waco)

Sounds like a very cool project, especially seeing as the Y-block is still intact.

Here are a couple of web pages that might help shed a little light on your block:

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

http://www.supermotors.net/articles/lfm-issue03-a2-1.php

When Bing did his engine he also wanted the block that came out of his truck (a 272) so after sonic testing I bored according to core shift and had no problem with .030" over 292 (3.780").  The shift in his was not too bad.  Like Ted said

Sonic testing will tell you up front if your 272 block is a candidate for boring out as far as you’re contemplating.

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

Howdy; I agree with crenwelge about using a 292. Punch out a 292 .090 over and you end up with a .040 over 312 bore. Use the 272 8.5:1 heads, compression will jump to over 9.3:1 with slight planing (.005 to .007 clean up) of the heads.  I ran one of these for a long time and it ran good, did not get hot and had plenty of wall left. The old Ys are so much fun to mess with because of all the different variations you can come up with. Have fun!

Howdy its not impossible to do what you want.  As Tim mentioned I wanted the same and got pretty close.  my local shop was not willing to go that far due to the shift but Tim as will.  Don't feel bad about beign pushed into using a 292 as you are getting basicly the same responced I got when I mentioned the idea.  It possible but it might be easier accomplished with a 292.  Bing   

Warsaw, IN