Is this possible? I realize I will have to use the narrow brake band
FWIW, I was able to replace the 'injured' hogshead on the '25 engine in Dad's '26 TT with a later hogshead. That '25 engine had also been equipped with the wider '26-7 pedals.
Merv; Maybe this will help, I did the opposite, I put a 26/27 hogs head on a 1921 transmission and engine with the wider 26/27 brake band everything fit and works fine, the only thing I had trouble with was the 1921 oil pan, it wasn't wide enough for the larger brake band ,I had to stretch it. The pedal spacing is different, you will need to use an early brake band on the wider brake drum but I don't see any other problem. Brad from New Hampshire.
My 25 touring came to me with a 25 trans cover and pedals over a 26/27 transmission. The narrow band covered the front 2/3 or the wide drum but it all worked just fine. The pan was a 4 dip, not sure about using earlier 3 dip pans.
It should work, the three dip pan should also clear the wide brake drum without shortening - compare the complete brake drum assemblies with driving plate - the narrow style drum will have a driving plate with the bosses for the clutch arm pivots out and about as far back as where the drum surface is on the wide drum. Both take about the same room in the pan, but there's no room for the wide band in a three dip pan.
Thank you all. I have a decent late transmission. Thinking of installing with a aluminum hogshead to save a bit of weight on a race car
Les, it should fit with no worries, depending on the pan. Occasionally there is not quite enough clearance in the pan. The pan can easily be massaged a little. Just check as you go.
Allan from down under.
Les you may find, depending on the type of detachable ears on the transmission bands that they may need some additional work to gain clearance between them and the aluminum hogshead. Of course none of this would apply to non demountable bands.
I really appreciate the comments. All great info