Any pictures of chamber in the "D" heads?I am curious because I have one D with a 58 style chamber and one stamped "D" head with a 57 style chamber.Both came off a 56 big truck engine,obviously one was changed at some point.

A big truck?   Is it a 292 or a Lincoln Y ?   Lincoln y is a different animal.   

Did you mean 0.021” rather than 0.0021”?  If the number is 0.021” out of the hole, then that likely indicates at least 0.050” cut from the decks.

Lorena, Texas (South of Waco)

A surgeon never says OOPS!!  BUT, I'm not a surgeon.   Guess I got carried away with the 0's.   And yes,  I meant  0.021.          At 0.0021   I doubt you'd ever  had problems with the pistons  just cause of the head gasket thickness.

Olweldingrig   I will post a couple pics of those heads maybe Thursday.  Got to go see mom tomorrow before work.  Plus its 5 degrees outside tonight!!   LOL

OK  Here's a pic of 2 heads.  Used one is the D head.  The other is from the set of new heads I bought.

I've been reading a lot of posts on here.  Lot's of information and ideas.   Ted has mentioned a few times about using metric rings for less drag in the bores.   Can they be used with the standard rebuild pistons for a Y?    Since I'm going to build a torque engine and not a screamer,   is there an advantage to it?    I now have a 312 crank and rods.   Is there any off the shelf pistons that will work on my rods without throwing a bunch of money at it?   I plan on pulling my 292 and boring it.  I'm going to have the crank turned to the 292 mains.   

By standard piston, I think you mean a piston made to original specs.  In that case, metric rings will not work because the groove will be too wide.

The thinner rings will help for torque.  Horsepower is a function of torque.  Everything else equal, more torque = more horsepower.  Whether it is a "screamer" will depend largely on the cam.

I think Mummert stocks modern design pistons that fit stock rods and strokes.


Lawrenceville, GA

Pat.  In having the 312 crank machined for your 292 block, yes, you need to have the main bearing size changed, but remember to have the rear seal diameter and the oil slinger size changed to 292 dimensions, too.

Click the link below to see the dimensional info supplied by John Mummert's wed site to provide your machine shop.
http://www.ford-y-block.com/crankshaftid.htm

Hope this helps!  


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

Well,   progress is hopefully on its way.   I picked up a never run 312 that has a cracked block.    .060 over pistons,  rollmaster chain,  and some other new stuff.   I disassembled it and pulled the cam.   It's a crane cam.  I emailed their tech people about the specs.  They replied with a copy.  Can anyone give me their opinion if its gonna be a good match for my  F350?   My highway cruising is at about 3,000rpm.    Figure  5,000lb for truck.

1960ford350 you are building a truck engine, not a hotrod engine, you need torque and reliability, good gas mileage wouldn't hurt either. Start thinking truck, not hotrod.