Rowdy /6 Timing Curve Recommendations
When switching to electronic, try to find a distributor that is close to what you want.
Check out this '78 /6 curve.
View attachment 1716209006
I have 2 of those same ones.
One of them I bought NOS a few years ago, it's in my truck now. Just as removed from the box.
So far all I have done is to break in a fresh overhaul with it, no miles on it just a couple of hours running in the garage.
The 2nd one, same tag number, I've taken apart to clean it up and I changed the heavy spring to a lighter one (I think it was referred to as the "medium" level)
There was a guy on here a couple of years ago that had a **** ton of Mopar distributor springs listed for sale, I got a couple of sets of them at the time. I also replaced the VA can because it was shot. At one point I knew what governor was in them, I don't remember.
Also there's different advance cans they have numbers on the arms that attach to the advance plate within, at one point I read (either on here or on the /6 forum, can't remember) a recipe of sorts for exactly which VA can and which governor was ideal for different application, can't remember where I saw it. I do know that the VA can that I put in the used dist had a different number in it than original, and was the one suggested for my type of build/usage. I have another can the same as that one, that I was gonna swap into the nos one, but wanted to see how it does with the nos distributor "as is/untouched" then experiment with the other one I have here, keeping the original one as a reference of sorts.
That dist is spec'd for factory super 6 apps.
My app is 85 d150, 2wd long bed. 3.21 rear, at this point still have the original 727 in place. (yes it's a 727, I know the differences)
Engine is a fresh 74 short block 0.020 over, rebuilder grade pistons, 0.185 in the hole (even after a 0.030 block shave) 77 peanut head, shaved 70 thou, Aussie head gasket, think it was something like 0.039 installed thickness, calculated and measured CR came out right at 8.4:1 (expected higher since that's exactly what the manuals claim these engines were from factory without the deck/ block shave but measurements prove it is what it is) ported, oversized SI brand valves, super 6, nos BBD 318 "heavy duty spec" from about 1977, ported stock exhaust manifold, outlet opened up to true 2-1/4 to match the head pipe and outlet gasket matched. Oregon #819 cam.
Final configuration undetermined, have parts on hand to put either an 833OD or else an A500 behind that engine, I don't know how either of those would effect how I would have to set up the distributor curve.
I have put in a factory 4 pin ignition box, also considering swapping out in favor of an HEI module. Also unsure how that change might also change how the engine Will want the distributor to be calibrated vs the stock Mopar box.
The specific Mopar box I have is a niehoff brand replacement from late 70s/early 80s....it too is brand new old stock. (And American made) for Nothing special, don't know specifics between it and an Orange box or blue box as was common in 80s trucks, or any other Mopar style 4 pin ignition box.if there truly is a difference between them that is
