Big Six FAQ

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Q: how do i convert my ignition back to points (yes, i am frequently asked how to do it)

A: first, buy a distributor for a 1968 240/300.
then look through the wire harness going to the ignition module (which you're getting rid of) to find the wire which is hot while running. if there is a resistor wire already in the circuit, connect this wire directly to the + side of the coil; otherwise, connect it to the coil through a ballast resistor.
also run a wire from the (I) terminal of the starter solenoid to the + side of the coil. (WARNING: do not use the wire that is hot while starting at the module for this purpose)
next, connect the wire coming out of the bottom of the distributor to the - side of the coil.
thats all there is to it. now its just tuning. dwell = 37-42, plug gap = around 0.030, timing is wherever its right

yes, its really that simple


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Bret posted:

I found the flow rates for MC2100/2150 2 barrels.

This information comes from CJOFFROAD.COM. That website has a ton of information on these carbs.

2V 2100/2150 at 3"Hg. Venturi size listed first.

0.98 = 190 CFM 24.9mm/24.9mm syncronous venturies.
1.01 = 240 CFM 25.6mm/25.6mm " "
1.02 = 245 CFM 25.9mm/25.9mm " "
1.08 = 287 CFM 27.4mm/27.4mm " "
1.14 = 300 CFM 29.0mm/29.0mm " "
1.21 = 351 CFM 30.7mm/30.7mm " "
1.23 = 356 CFM 31.2mm/31.2mm " "
1.33 = 424 CFM 33.8mm/33.8mm " "

When comparing to 'metric' carburetors, remember that venturi size is not the same as bore size. In example, a Weber 32/26 has venturies of 26mm/27mm.

Link to original thread:

Thanks for the info. This info is often sought after.

Remember that four barrels are flowed at 1.5 "hg. So these flow numbers do not equate to 4V flow. To convert divide by 1.41.

So, for example, a 190 2V would be equivalent to a 135 4V.
A tri-power using 3 of these 190s equals a 404 cfm four barrel.

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