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#1
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timing for my crate 360
i have a 1967 dart with a crate 360 390hrsp what should be the gap in the plugs and how about the timing? when i get on it it seems to backfire or rumble inside the pipes! im new and trying to learn....thank you so much for your help....
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#2
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Total timing is 36* max or a couple degrees less depending on compression and octane you use. Plug gap should be .035, but, top find the max gap keep opening them up at .005 intervals till you pick up a high speed miss and then back them off by .005. If the miss goes away, back off another .002 for insurance and wear.
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#3
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That's right...........
Listen to da man..............
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#4
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Just wondering how this advice helped. I also have that motor in my dart. I called the mopar hotline and they said it should be 15 degrees before tdc or maybe a little more. I notice a little vibration in the motor and maybe I'm running late timing?
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#5
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They are telling to to set initial timing and I told him how to set total timing which is by far much more accurate. When using a dial back timing light you raise the idle high enough to max out the mechanical advance weights in the dist. and set total timing. When you set it to idle and put the timing light back to 0 and recheck the timing it should be close to 15* initial depending on how the dist. is set up. You also do not run a vacuum advance when running total timing. They tend to add too much timing advance anyways.
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#6
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set it at 10 to 12* to start with and go from there....
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#7
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If the distributor in your engine has an adjustable advance mechanism try to get 14*-16* initial [up to 18*-20* will work] with total being 32*-35*. Small block heads have a fairly efficient combustion chamber and don't require a lot of total advance. Your engine has a fair amount of cam and not a lot of compression so initial advance has to be fairly aggressive. Plug gap depends on the type of plug and type of ignition. Using regular Magnum plugs gap at .035 for standard electronic ignition and .045 for a CD type ignition. FWIW CD type ignitions work best with non-resistor plugs. Hope this helps, good luck.
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#8
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I agree....However don't forget that 67 dart is new at this...
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#9
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Buddy of mine has that motor(360/390HP) in his Challenger. Im pretty sure we are running right at 18-20 initial timing with 36 total. Car runs good and trapped 104mph first time out to the strip.
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#10
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The 380/390HP crate motors have magnum heads. The magnum heads require less total timing than an LA head. I am running 33 total on my magnum headed 360 with 15 degrees of initial. I have more compression and approximately they same cam duration as a crate motor.
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#11
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Quote:
I agree with the above. Magnum heads have very efficient combustion chambers and do not require as much total timing as the earlier LA heads do. You cams duration,carb and your cars gearing, Transmission and converter will take part in how much initial timing I would set it at. Likely it would be any were from 14 to 18 degrees. Plug gap is a trial and error thing but the hotter the ignition system the more gap. I usually start with 40 for anything with a hot ignition system. 35 is for stock coils and 7mm wires, LOL |
#12
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67dart....Keep us posted how things are going??????
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