John, Gary, I will wait for the forged domed pistons, now that I know they are on the way.   I was worried, because the pistons are the only component missing, except a rear seal, and maybe head gaskets. Will a standard Felpro comp head gasket work on 3.860 bore?   

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

Works on mine.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

I don't know how common 312-.060 over pistons used to be, or if the following has any bearing on the current situation. But as I recall, Ford only made pistons up to 0.40 thou over size for 312s.

Paul

Gary: I'm sure that many of the guys on this site, would just love having to admit that their 312 Ford had 283 Chivy, (cough, spit) pistons in it....

Paul

I have 283 pistons in my 312 in my car hauler, but I wouldn't do it again.  The tops of the pistons have to be cut to Ford compression height, the Ford rods honed to the 283 pin size, the small ends narrowed to fit between the piston bosses, the pins shortened, and the piston pin bores machined to accept the pin locks.  I did all this to save a block that was already .060 over.  When it was all said and done, it wasn't worth the effort.

John - "The Hoosier Hurricane"

I swear I removed a piston from a Ford 3.0 or 3.8 V6 a few years ago and it measured 3.80" what the pin diameter and location were I don't think I measured, any one know if those would work? they must sell those oversized.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

I've seen a number of 312's rebuilt by Ford reman shops with .0425" O.S. pistons. Where did they get rings for those pistons?

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

i had a set of these in a 292 truck engine i didnt know they were 312 pistons until i happened to measure the bore.i just used a set of .040 rings.what else could you do.

Did you happen to measure the ring end gaps on that build?

Lorena, Texas (South of Waco)

John (Ted Tim or anyone), what is the piston pin height (compression height) of the forged dome pistons, and plus minus variance?  Using the new rods and one of the .040 OS pistons that were in the engine, I should be able to figure out the decking required. 

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.