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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 02-06-2012   #1 (permalink)
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Default Spark Control Valve and Load-O-Matic Distributor

Ok, I'm now somewhat confused. I'm getting ready to do a 2bbl carb swap, new cam & lifters, harmonic balancer, and rubber lines on my 6. I've read the classicinlines.com website about choosing a carburetor and how I would have to change the distributor. (Well, I wouldn't because my car didn't come with a load-o-matic because it was factory equipped with smog.)

My question is this. My car currently has a carburetor with a spark control valve. Would that cause it to run poorly because the spark control valve can't do it's job or it interferes? What would happen if I removed the spark control valve The autolite 2100 I have from a 1968 Mustang doesn't have one so once the carb swap is done it would be fine, but that is a month or two away. Thanks guys, Michael.
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Unread 02-06-2012   #2 (permalink)
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If I understand correctly. you have a non LOD distributor and SCV carb. No, it won't run correctly using the vacuum port on carb for the distributor. You can run the distributor off of manifold vacuum and plug off the SCV on carb till you do your change. I've done the same thing on my son's till I find a non SCV carb. I actually took an old SCV valve and sealed with JB Weld and plugged the existing vacuum port. That way I can pop a new SCV valve in it and let someone have it that needs one.
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Unread 02-06-2012   #3 (permalink)
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Sweet. Next question, how do I go about that. My car is still an auto (it has a dagenham 4spd waiting at home), so the auto trans line is in the manifold.
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Unread 02-06-2012   #4 (permalink)
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"T" fitting. You can find some fittings to work at any good parts store. You will have to retune for manifold vacuum.
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Unread 02-06-2012   #5 (permalink)
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Cool, thank you so much. My timing was off, that was going to be this weekends job, so I'll try and do it all together. Could you please post a picture of your son's setup? Thanks, Michael.


P.S. What would happen if I just unscrewed the spark control valve?
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