Technical Question for Y block guys

greetings HAMB brothers and sisters!....as my screen name indicates I love my FORDs but don't claim expert status! A good friend of mine has told me 312 crankshafts can be identified by an " aspirin sized bump" on the outer radius of the flywheel flange ....would this hold true for ALL of them, even " replacement " parts?....also are B8ae and ECZ both 292-312 blocks?...I'm pretty sure the ECZ is.....as always thanks in advance for any info!....also, yes I know that I could " sorta measure " the stroke with a rod down the sparkplug hole , just hoping for an easy ID in a field I.D. Type situation!

 

I have heard about the asprin dot, never seen one but I believe that’s only on stock cranks. Easiest way I know is to drop the pan and check the caps EBU is 292. ECZ is 312

 

Almost all of the 312 cranks have the "dot"

I have heard and also experienced one 312 crank that did not have the "dot" .That engine/crank without the "dot" was in a Canadian produced 312 engine.

I dont believe there ever was a B8AE casting. There is a B9AE casting that is both a 312 and a 292. You will usually find those B9E casting in Mercurys.

Picture of the 312 identifing "dot" below.

Oldmics

 

You should familarise yourself with John Mummerts website.

He is the GURU on Y Block stuff

http://ford-y-block.com/technical.htm

Oldmics

 

My understanding is that crankshaft is the easiest identification. And, the one 312 I own has that feature on the crankshaft so at least that one was verified that way.

 

Take a 312 crank and cut the mains to fit the 292 block; 312 pistons and rods and you have a 312. EASY.

 

Or just bore a 292 out .125 and you have a 312.

 

Not quite right !

312s came out in 1956 .They did cease to be installed into Ford applications in 1957 , however Mercury continued on with the 312 until 1960.

Oldmics

 

Yep, my 312 is a 56.

 

Thanks for all the info guys, the story on my engine is this...my slightly off topic 1960 3/4 ton four wheel drive truck was bought by my uncle in about 1963 and had a spun bearing. When having it repaired he wanted a 312 crank installed and believed that one was. I am going to study John Mummerts web site and see what I can learn further!...thanks again guys!