Carb replacement

[Anonymous]

I have a 64.5 mustang with a 170.The stock carb is on there right now and I believe it is a Autolite 1100.I was told it needs to be rebuilt but will be OK for a while.I have a Carter YF from a 72 Maverick that I would like to rebuild and replace the Autolite.Will this be a direct swap and will I notice the difference?

Thanks

 

[61Futura]

From what I have read here, you will have a timing advance problem making that swap. I think you can't change the distributor to one that matches the carb because the old block has the small opening and small shaft to the oil pump. Maybe a 64 1/2 block has the larger opening than the 63 block I have.

 

[CZLN6]

Howdy Ponyman:

Yes, you can use the Carter YF from a '72 Maverick. If the Maverick was a 200 engine you will get a noticeable difference in WOT performance. A 170 1100 is rated at 156 cfm. A 200 YF is rated at 187 cfm. The big difference is the linkage. Your stock 1100 has a mechnical rod and lever system. The Maverick and YF had a cable from the pedal assembly to the carb. It is possible to adapt your stock linkage, and also possible to adapt a pedal and cable assembly from a Maverick.

Another difference may be the adaptor plate that sits between the manifold and the carb. You'll have to look it over to see what works best.

61Futura raises a good point about the distributor. Your 64.5 distributor is called a Load-a-matic and is a vacuum advance only system. The system includes a vacuum source on the 1100 carb called a Spark Control Valve. It is supposed to send a modified ported vacuum signal to the carb depending on load. If you change carbs you will lose the SCV function and be left with a ported vacuum signal, or a full manifold vacuum signal. I'd try the ported source and see how it works.

Ideally you should upgrade your distributor to the '68 and later point type distributor or '75 and later electronic ignition system. Both of these have vacuum and centrifugal advance features. Either is an improvement over your stock Load-a-matic distributor.

The limiting factor is the concern 61Futura raised. Early blocks had a smaller hole where the distributor penetrated the block. They also have a smaller diameter oil pump drive shaft. These details make a later upgrade very difficult. For all practical purposes, If you have the early, small hole block, you well likely have to make do with the distributor you have.

Do you know the casting # of your block? If it is a C4XX casting you will likely have the small hole. It you have a C5XX it will likely be the larger hole. Casting # is on the side of the block under the exhaust manifold.

In either case increase the initial advance setting 5 degrees more than stock.

Enjoy the journey.

Adios, David