Hello. I own a 1955 Victoria with her original 272 Y-Block. The engine is getting tired, so I´m starting to think about a complete rebuild. 272 pistons are impossible to find here in Argentina, but I can easily find 292 pistons, because the F100 was produced with that engine here. The question is: Is it possible / advisable to bore the 272 block to standard 292 pistons? Does anyone tried this? Thanks a lot for your help. Kind regards. Augusto.

Subject to other comments, i can only tell you i,v been donig it for over 40 yrs, boreing 272,s to 292 std bore, dont suggest going o/size on 292. There is allways possibility of cyl wall thickness but never had problem in that time.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Augusto;

Yes it is possible to bore from 272 to 292 specs. I did this with my 56 F-100. As Aussie Bill suggested, I wouldn't go with much more unless you have machine shops there that can sonic test the block for cylinder wall thickness and possible core shift.

Rono

  Ron Lane,  Meridian, ID

As Bill and Rono bring up, going past a standard 292 bore gets the 272 block really on the thin side. Sonic testing the block will at least show where the core shift is located which can help the machinist in moving the boring bar to help equalize the cylinder wall thicknesses. Here are some past threads on the subject.

http://forums.y-blocksforever.com/FindPost18677.aspx

http://forums.y-blocksforever.com/FindPost41511.aspx

http://forums.y-blocksforever.com/FindPost41541.aspx

http://forums.y-blocksforever.com/FindPost39639.aspx

Lorena, Texas (South of Waco)

In looking for the original post that had the sonic sheet for a 272 that had been bored to a standard 292 size, I find that it must have been on the old site as it’s no longer available. With that in mind, here's another sonic sheet for an over-bored 272. The bore thicknesses highlighted in red do make this block questionable for use. Had the block been sonic checked first and then offset bored to compensate for core shift, then the block could have still been more suitable for use.

Lorena, Texas (South of Waco)

Ted, I do not mean to hijack this thread but for the sake of conversation, what is your opinion of the practice of installing 8 sleeves? Thanks.

Valid question. Would the OP be better off doing this and reusing the stock pistons? Provided they're sound of course

Unnecessary expense just to use old pistons in my view.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Gee I hope my 272 is OK I've just had it bored .020" up on 292.

Has anyone tried coating iron blocks like aluminium motor cycle bores are nickel plated?
What about ceramic coatings????

I agree. But if they aren't available..........