1972RedNeck

Could anybody tell me what the bore is on the stack first gen clutch master cylinder? I am doing a swap on a '66 Ford and am trying to figure out if I can use a Ford master cylinder...

thrashingcows

Usually they are 1.125" or 1 1/8".

1972RedNeck

Were there different sizes between '89 and '93?

j.fonder

according to raybestos, its the same MC from 89-93 and yes, they are 1 1/8"

jerseybud

Guys, he's apparently talking about the clutch master cylinder? Which is 7/8 out of a diesel w250.
So which do you want to know, OP?
Putting a Cummins in a 66 Ford? Sounds cool so far.....

thrashingcows

Your right....Dohhh!

1972RedNeck

You're right. The Ford clutch master cylinder is 1 1/8". If the Dodge ones were only 7/8" that may present some problems as I was hoping to use the stock Dodge slave...

Thoughts? Mixing the two would result in a stiffer pedal and blown apart slave cylinder, right?

j_martin

True dat if the stroke on the master cylinder is the same. Pedal geometry needs to be considered in the calculation.

If you're using the stock Dodge pedal linkage, you'd need the smaller MC.

1972RedNeck

I didn't think about the stroke. I am trying to use all the Ford parts (pedal, linkage, cylinder). Anybody know the stroke of the master cylinder?

j_martin

What you need to figure this out is the dimension on the pedal arm between the pivot and the push rod for both linkages to compare.

Then you can do some math and figure out how much fluid each will push with the same arc of pedal motion.

If the pedal positions (either pedal or pivot) are different, you'd have to include the dimension between the pedal and the pivot in the calcs.

1972RedNeck

Pedal travel could also be different too. I'll try to get some measurements off of a buddies truck.