57Ranchero.  I'd encourage you to read a thread from 4 months ago titled, 'De-stroked 292 Y-block'.  It delved into the idea of using a 3.10 Ford / Merc crank as you have suggested, maximum bore, rpm range, engine torque, etc.  Ted Eaton, Joe-JDC, Miker, John Mummert, and others made significant comments in the two page posting. 

Click the link below to access this thread from the Archive.
http://forums.y-blocksforever.com/FindPost136569.aspx

I think you'll find the read very informative.  


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

57 Ranchero;

If you already have the Mercury crank, I can understand why you want to try to go this route. I chose a different approach with my 292 C2AE block; I bored it 0.060", used a 312 crank and had the rod journals turned down to 292 specs. Used C2AE rods and 312 pistons which had to be milled down about 0.063" (due to the longer rod length) to achieve 0 deck height. That comes out to about a 317 cu.in. motor....and it runs really good.

  Ron Lane,  Meridian, ID

no block will go that far.it takes a good one to go to 3 7/8

Sonic check the block to make sure it will go that far.  The pistons will probably have to be custom.  Since you know the other dimensions, you know the compression height needed.  A 4.00" piston should be very common.  Look through catalogs and email or call manufacturers to see if there is one that will work or can work with little modification.



Lawrenceville, GA

Good luck finding a block that will go that far, I think a ECK Block maybe thicker but I don't think it will go 4.0"

boring the 292 truck block to 4.00 inch diameter; using 256 merc crank with 3.10 stroke; using 6.252 rod length which yields 2.01 R/S.
This should produce a 311.6 ci displacement hence approximately 312 from a little bit different direction; also, this yields a Bore to stoke
   ratio of 1.29. what is best piston to use?