Spark Control Valve

[Anonymous]

I'm new at this...

Just rebuilt an Autolite 1100 for a '66 mustang.

The shop manual shows a spark control valve, which should connect to the distributor. THe manual shows the spark control seat is threaded - but on my carb there are no threads. The carb seems to have a place to put a SCV but it is not threaded - and the hole doesn't seem to lead anywhere. The rebuild kit has a threaded SCV, which I cannot use.

Does anybody know why - or what I should do about it?!

Does the fact that the carb comes from California have anything to do with it (emissions or something....?)

 

[CZLN6]

Howdy Strikerd:

You're absolutely right. '66 & '67 California Emission equiped vehicles have a unique 1100. The good news is it has no Spark Control Valve or Load-a-Matic distributor. It has a distributor with both vacuum and centrifugal advance and has a ported vacuum source from carb to the dostributor. The bad news is the carb capicity is down sized from the rest of the world- from a 1.20" venturi to a 1.10". Decreasing flow from 185 to 150.

The newer style distributor makes up for some of the driveability and durability problems with the Load-a-Matic distributor, but no enough to make up for the down-sized carb.

Adios, David

 

[Anonymous]

Thanks David!

I may have a Load-a-Matic distributor - I'm not sure. My car was built for the Washington DC area - not built in California. I suspected the carb came from california and knew they had emission stuff that would suggest a different carb...got the autolite on ebay.

How do I know if I have a Load-a-Matic? If I do, do I need a spark control valve - or can I use the carb I just rebuilt!?

Thanks for your advice.

Dawn STriker

 

[CZLN6]

Howdy Back Dawn:

IF you see advance return springs when you remove the distributor cap it is a Load-a-matic, vacuum advance only distributor that requires a carb with a Spark Contol Valve to correctly signal it.

IF it is a L-a-M, I would get a correct carb. I do not know, for sure, how to go about modifying an 1100 to convert a non-SCV to a SCV, or vice virsa. It is my belief that there is more to it then just removing the plug and screwing in a SCV. I think there are some internal channels that must be modified to go from a ported vacuum signal to the SCV signal.

Sorry.

Adios, David