71 clutch and brake pedals
But not all the pedal sets before '71 were HD. Basically, any pedal set that isn't an HD set will work for sure. They might not all be "correct" because of the neutral switch, but all would work fine.
As for the HD pedals, I'd need to get a measurement to show that they actually had a longer throw. The clutch pedal pivot is in the same place, the pedal itself is the same length, so the stroke on the clutch pedal itself is the same. It's hard to tell from the pictures above, but it looks to me like most of the additional pin-pin length comes from the section of arm that has the spring mounted on it being longer from the spring mount to the pivot. That changes the mechanical advantage on the spring, but not the throw on the clutch. Which would make sense, because the spring was heavier. That way the effort to work the clutch would be similar as the non-340 cars.
I checked all of my pedal sets (4), but all are non-HD pedals. So I can't measure the length of the arm with the clutch pedal rod mount. The length of the arm from the pivot to the clutch rod mounting pin would be the key length. On the non-HD pedals (the ones with the 5.25" pin-pin length) that arm is ~2" from the centerline of the pedal pivot to the center of the clutch rod mounting pin. If that distance is the same on the HD pedals, it doesn't matter which set you use with exception of the spring, which gets removed if you have a diaphragm type clutch anyway.
This is what I'm talking about...
But not all the pedal sets before '71 were HD. Basically, any pedal set that isn't an HD set will work for sure. They might not all be "correct" because of the neutral switch, but all would work fine.
As for the HD pedals, I'd need to get a measurement to show that they actually had a longer throw. The clutch pedal pivot is in the same place, the pedal itself is the same length, so the stroke on the clutch pedal itself is the same. It's hard to tell from the pictures above, but it looks to me like most of the additional pin-pin length comes from the section of arm that has the spring mounted on it being longer from the spring mount to the pivot. That changes the mechanical advantage on the spring, but not the throw on the clutch. Which would make sense, because the spring was heavier. That way the effort to work the clutch would be similar as the non-340 cars.
I checked all of my pedal sets (4), but all are non-HD pedals. So I can't measure the length of the arm with the clutch pedal rod mount. The length of the arm from the pivot to the clutch rod mounting pin would be the key length. On the non-HD pedals (the ones with the 5.25" pin-pin length) that arm is ~2" from the centerline of the pedal pivot to the center of the clutch rod mounting pin. If that distance is the same on the HD pedals, it doesn't matter which set you use with exception of the spring, which gets removed if you have a diaphragm type clutch anyway.
This is what I'm talking about...
