Join Date: Apr 2005
Location: Pensacola, Fl. U.S.A.
From the video I suggest that both the timing is off and the engine is running lean.
The 472+3(6) is a short version of the 550, but with less off the seat duration to make higher torque. The 785 exhaust is a proven high torque exhaust only lobe design. There are several other BB members running this and similar RjR intake cams with this exh cams. Perhaps they might speak up. I`ve see the profile of Joe`s 11mm intake cam. It is a good mild INTAKE cam designed for Carb intakes but early duration is high and if I remember correctly was described as a high overlap cam design, and not an appropriate exh application. If tuned correctly the 472+3/785 pairing should easilly accelerate in 5th gear from 2000 RPM.
As to timing, the 123 distributor should be set at the "D" curve with max advance at 34 degrees. That will result in static timing of 13 degrees BTDC and this curve is a straight line with advance not starting till 1000 crank RPM, and maxing at 4000 RPM (21 degrees total). Again a proven setting.
From the picture I see you are running old type metal wire for the coil & spark plugs. I would be concerned that you might have interference and as well check the rotor as it is a resistance type which are prone to failure. However if the 123 is only triggering to a coil with a primary resistance not lower than 1.0 ohm using modern spiral wound resistor wire then you shouldn`t have 123 failure or rotor burn out.
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Last edited by Alfar7; 06-04-2017 at 06:51 PM.