Inliners International Forums General Discussion MOPAR dual carbs

Hello, I'm new to this site but have read most of the posts trying to find an answer to my questions, and have found great information. However, I'm a little confused. So here are my questions. I have a 39 P8 delux 201, original exhaust. I have a offy dual intake manifold for 1 barrel carbs. I have matching carbs [D6A1] to use. One is working on the car right now, and the other I rebuilt. I know each has to be the same ie. jetting etc, but do I need to lean out, get a split ehaust manifold [more in more out] any other info I could get would be very helpful. Also, can I get a pertronix igniton for the orginal dist? P.S. I live at 9000'. Thanks in advance

You will get a noticeable amount of increased power in just splitting the exhaust. Adding a second carb will give you more power but it will be in the single digits where the split exhaust will give you about a 10% increase. In my case my '49 D30 230 cu in motor I added a second outlet but did not split the halves. This way I am still able to use my intake heat riser. I also did more for carberation, I built an adaptor and added a holley 94 2 barrel carb rotated 90 degrees. This way I only had to make 1 adjustment to the stock throttle linkage. You might check out the www.p15-d24.com website. A lot of those folks use a dual carb setup and will be familiar with the tuning charcteristics

Jim

On the carb question stock jetting should be fine. If you go to a dual exhaust you may need to richen them slightly.

One handy mod is to put an oxygen sensor in your exhaust and connect it to a volt meter. You can read off your mixture strength and adjust carbs accordingly.

There are several web sites that describe the process in detail if you do a Google search.

If you rebuild the carbs it would pay to fit the throttle plates as tight to the bore as possible. This will make it easier to get a good slow idle adjustment.

Carbs made for multi carb installations come with a thicker throttle plate that fits tighter for this reason.

If you are running 12v negative ground, you can use a GM mini HEI distributor from Langdon's Stovebolt Six, $180.



Pete