1cm

[rotorwrench]

I guess it depends on how high the crown of the dome is. All the Ford made 8BA pistons were domed originally. The Mercury and Ford pistons only differ by the piston pin location since they have the same con rods. The French made SUMB engines are the only exception to that rule that I'm aware of since they made a shorter con rod for their 255 CID engines.

There have been all sorts of aftermarket 8BA type pistons over the years depending on application and manufacturer. Some have a cone shape dome instead of a radius shaped dome and some were made on a different radius.

[36coupe]

My Mercury engine still has a lot of the original green paint ECM heads 4” crank and it came with a 3 bolt manifold and a strange tower on the 3 speed that the shifter came forward up over the back of the engine.

[V8COOPMAN]

Originally Posted by 36coupe

My Mercury engine still has a lot of the original green paint ECM heads 4” crank and it came with a 3 bolt manifold and a strange tower on the 3 speed that the shifter came forward up over the back of the engine.

Are you maybe talking about a trans with a shifter like this? DD

[rotorwrench]

Cab Over Engine (COE) trucks had a different shift tower arrangement. Maybe that's why it has the strange shape.

Another thing I wanted to mention on post 38 is that all the 8BA era blocks were basically the same. Ford Dearborn used the same casting till sometime in 1951 when they added a 1BA casting mark in the lifter valley. This designated two things. The 1BA blocks had the rotator type valves and the crankshaft had a larger bore in the back end to accept the automatic transmission torque converter.

I would not be surprised if a Canadian C8BA block had Mercury heads if it was truly an OEM Mercury 255 build but it's easy to replace the heads too. Some of the Canadian truck engines I've seen had the tan color paint but I don't know how far that went. Ford Dearborn even changed colors several times in the 8BA era depending on whether it was a Ford, Mercury, or a truck.

With Canada's separate Ford and Mercury dealer system it made for a lot of interesting differences from their US counterparts. It likely makes it hard to get parts for some of the semi-orphan models like the Comet and the Monarch cars since there were no US counterparts.

[rotorwrench]

Those Lincoln side shift set ups were definitely different.

[V8COOPMAN]

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Originally Posted by rotorwrench

Those Lincoln side shift set ups were definitely different.

Ha! You wanna see "different"? You ALSO wanna see "side shift set-up"? Compare the bolt pattern on the SHIFTER cover on BOTH boxes....they are both the same Lincoln Zep CASE! Does everyone realize what the BOTTOM transmission was used in? DD

[51504bat]

Originally Posted by V8COOPMAN

Ha! You wanna see "different"? You ALSO wanna see "side shift set-up"? Compare the bolt pattern on the SHIFTER cover on BOTH boxes....they are both the same Lincoln Zep CASE! Does everyone realize what the BOTTOM transmission was used in? DD

Given the clutch arm on the right side of the trans I'd guess English or Aussie but of course that is just a guess.

[V8COOPMAN]

Originally Posted by V8COOPMAN

Does everyone realize what THIS transmission was used in? DD

Simply put, it's a RHD (Right Hand Drive) trans used 1940-'48, as in the second picture below! It's interesting to note that the INSPECTION Cover and the 'Serial #' pad are not lined-up straight on these. DD

[Fortunateson]

Export if made in Canada or the US to commonwealth countries that drove on the original side of the road.

[36coupe]

This is a valve from the mercury block, I guess the C stands for Canadian.

[rotorwrench]

If Ford of Canada changed to rotator type valves than that is likely an example of the Canadian part. They used the C in the prefix on a lot of their parts.