i have a block with no casting number were they usually are i have narrowed it to a 390/410 the piston says 410 but i dont know whether to trust it or not tell me were else to look or do.
Bore is 4.05 i cant tell the stroke if i could i would

 

Pull a plug. Get a 8 inch piece of white 12 or 14 guage wire. Put one end of the wire into the cylinder. Have somebody crank the engine while you hold the wire down against the piston while holding a pencil against the wire. The wire will move up and down with the piston and the pencil lead will mark the wire. Measure the length of the pencil mark; 3.5 inches then its a 360, 3.78 inches and its a 390, 3.98 inches and you have a 410.

Bob
'66 7 Litre, top loader, 3.25 Traction-lock, Sidewinder Intake, SCJ Exhaust
'88 F150 LWB 4x2, XLT Lariat, 302, 5 speed, 3.08
'99 Ranger, 4x2, 3.0, 5 speed, 3.73 posi

 

dont forget that ford used 410 pistons for the low compression 390's sometimes, it's probably a 390.

 

What casting #'s are on the crank and rods?

 

360/390/410 if you have a complete short block the 410 is externally balanced ie. small wieght behind the dampener since it share's the 428's crank.

 

Just for clarification, all 410 and 428 engines are externally balanced with an additional weight on the flywheel or flexplate. Only the 428SCJ has the hatchet behind the damper in addition to the weight in the back.

Barry

 

A few weeks ago we had a long discussion and it was determined that the small hatchet weight was "a nice to have" if you were using stock parts and were not going to have the crank, etc, balanced.

But we know that when you mix and match to build a 410 it shuold be balanced using a 410 or 428 flywheel.

Bob
'66 7 Litre, top loader, 3.25 Traction-lock, Sidewinder Intake, SCJ Exhaust
'88 F150 LWB 4x2, XLT Lariat, 302, 5 speed, 3.08
'99 Ranger, 4x2, 3.0, 5 speed, 3.73 posi

 

I have a '74 with what I know is a 390 (I ordered it from the factory way back then), and it has a casting mark of "105" on the front of the block. Don't remember what that was for, but something you might look for.

 

almost all FE's have the 105 casting on them. I am unfamiliar with the 410 engine but isn't the 390 the largest FE (factory)that used the 4.05 bore?? I have heard that a 428 crank in a 390 block equals a 410. something to think about anyways

 

Dr. Ford, only 73-76 truck motors have 105 on the front of them the rest say 352.

 

The 410 was the largest factory FE that used the 4.05 bore. They were offered in Mercury cars in 66 and 67. They were a C6ME block with a 428 crank. The C6ME block was also used in many 390s, 360s and even 352s.

 

Come check my factory 410 for a C6ME-A, I'd like to find it LOL no numbers other than the "352" and other small mold numbers

 

FE427tp, I think you missed my point... I was trying to point out that the "typical" block used for a 410 was no different than a block used in many other FE's, ie 390, 390, 352, etc. It is always possible that your block was "supposed" to be a C6ME-A block but that the casting mold was damaged so that that information did not transfer. I am certain that they would not condemn a casting for such a minor fault. I agree that it also entirely possible that it was "supposed" to a different casting that for some reason was not transferred to the casting (although the choices of other possibilities are somewhat limited). I agree that when Ford assembled engines, they were very likely to use the parts that they had on hand and not be too concerned about the casting numbers. Many of us know that some 427 blocks were underbored and used in industrial applications (likely due to casting imperfections like core shift). You are right, one must always take casting numbers as just a starting place when investigating these old Fords as the parts are so interchangeable between so many different engines. Generalizations about casting numbers will always have exceptions to the rule. I was just trying to make a quick response as to the largest factory displacement engine with a 4.05 bore but I guess that I should have taken the time to more fully explain my answer so that everyone could understand it, I would hate to think that I had confused you or anyone else. ;-)
Bob.

 

I was just trying to point out that with fords of that era ANYTHING is possible

 

I truly believe that the guys in the Ford foundry made parts that no one in Management knew about for the "gray" market.

Bob
'66 7 Litre, top loader, 3.25 Traction-lock, Sidewinder Intake, SCJ Exhaust
'88 F150 LWB 4x2, XLT Lariat, 302, 5 speed, 3.08
'99 Ranger, 4x2, 3.0, 5 speed, 3.73 posi