Greetings to all:  I'm in need of one 312 piston.  Can be used but  must be stock sized.  I soon should be receiving my block, crank, heads etc. from the machine shop and would like to do a mock up to determine deck height before selecting the new pistons.  Hopefully someone still has one they hadn't discarded.   Will gladly reimburse for shipping/handling etc..  Thanks, JEFF.................


64F100 57FAIRLANE500

Greetings to all: Thanks very much for the posts. Excellent information was all brought out. I had prepared a reply and because some of it touched on what Ted explained I''m going to enter it in anyway.   Original pistons were Silvolites dated Jan 74 with 3 from other months. Maybe QC problems then? I plan to possibly use Silvolites again because everyone agrees they are a good maker of stock pistons.    It's true all aftermarket stock Y pistons have a shorter CD than what Ford used.  I was told this is to allow for deck machining. The max. in the hole of the 'old" engine was .028 add to that .043 for composite gasket and that put's the quench at a whopping .071.  I didn't know the exact CD of a Ford piston until Ted mentioned it in the last post. Thank you. This explains why the 57's ran so good then. The 57 manual lists in the hole distance of .010 to .026 for the 312.  Now, thanks to Ted, we know it was close to the .010.  Looks like there are some options here:  1.Remove metal from the deck but I only intend to remove whats necessary to square up.  2.Steel gaskets should take about .020 out.  3.Custom pistons-to be determined.    Noshortcut mentioned balancing, of course.  Fortunately there is a very good crank grinder in my area who prepared the 312 crank. This amazing shop produces cranks for most applications from billet. There's a page on John's site listing all the Y crank dimensions.        I can't answer the question regarding displacing the main journal oil holes. Do you think this could be an issue? The 312 crank with all the other items is still in the machine shop. Otherwise, I could compare it to the 292 crank.        In regards to the cylinder heads, it was noticed the 1" pads below the exhaust ports were .087 and .093 each head respectively. Two chambers each head were CC'd which showed the thicker head needed to catch up to the thinner head. I believe the shop reported aprox. 66 CC's average. These are posted G's.  Thanks to all for the great input, JEFF...........


64F100 57FAIRLANE500