Big Block Chevy tuning questions... - Chevelle Tech
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Troubleshooting Diagnosing problems done here.

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  #1  
Old Jun 29th, 06, 5:57 PM
wbaker01 wbaker01 is offline
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Default Big Block Chevy tuning questions...

I've got two different issues I need advice on:

1) Does someone know what the timing tab increments are on a Big Block chevy timing tab marker? The engine is a 73 454 and I can't see the increment marks nor read them on the timing tab marker.

2) This is the real question, I was doing some tuning today and can only advance the distributor to about 4 or 8(I'm not real sure due to question #1 above) BTDC due to the vacuum advance cannister hitting the back of the intake manifold. According to Edelbrock I need 10-14 degrees BTDC which I can't achieve right now. What's the easiest way to allow me to get more advance into the engine?

Thanks,
Bill
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  #2  
Old Jun 29th, 06, 6:12 PM
furball8994 furball8994 is offline
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Default Re: Big Block Chevy tuning questions...

Bill. One idea is to lift the distributor out, turn it one tooth counterclockwise and set it back in. If you have enough room in the other direction, this will work.Each mark is 2* each tip is 4*
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Old Jun 29th, 06, 6:25 PM
wbaker01 wbaker01 is offline
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Default Re: Big Block Chevy tuning questions...

Is there an easy way to tell what one tooth equates to?
What I have thought about doing is getting the mark on the harmonic balancer lined up at 12 BTDC and installing the distributor with the rotor pointing at number 1. That would achieve the same wouldn't it?

Thanks,
Bill
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Old Jun 29th, 06, 10:23 PM
Jerry70 Jerry70 is offline
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Default Re: Big Block Chevy tuning questions...

Quote:
Originally Posted by wbaker01
Is there an easy way to tell what one tooth equates to?
What I have thought about doing is getting the mark on the harmonic balancer lined up at 12 BTDC and installing the distributor with the rotor pointing at number 1. That would achieve the same wouldn't it?

Thanks,
Bill
Yes, that will work just fine. As I recall, each tooth you move the distributor is about 17.5 so one tooth over should get you where you need to be for a proper adjustment range.
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Old Jun 29th, 06, 10:34 PM
wbaker01 wbaker01 is offline
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Default Re: Big Block Chevy tuning questions...

I checked my timing and with everything disconnected and plugged up, I'm at about 12 degrees BTDC.
I also actually lined the mark on the harmonic balancer at about 12 degrees BTDC, popped the distributor cap, and the rotor is pointing right at #1 or about 5 o'clock. So, things appear to be where they should be, I'd just like to be able to dial in some more advance at idle which I still can't due to the vacuum canister hitting the intake manifold.

Thanks,
Bill
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Old Jun 30th, 06, 11:16 AM
ss3964spd ss3964spd is offline
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Default Re: Big Block Chevy tuning questions...

Bill,

Do what Scott said above; pull the distributor up, turn the rotor CC one tooth, and drop it back in. If you go slowly and carefully as you lift the distributor while trying to rotate the rotor you will be able to feel when the teeth disengage.

Once you move it one tooth you may have to use a little force to get it drop back down all the way. This is because the oil pump drive roll pin in the bottom of the distributor gear needs to re-align with the oil pump drive shaft slot. When I do this I just ensure the teeth are engaged, hold the dist body, and exert a bit of pressure when dropping it in.

Dan
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Old Jun 30th, 06, 1:10 PM
vrooom3440 vrooom3440 is offline
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Default Re: Big Block Chevy tuning questions...

If you are unsure what the marks are you could also figure it out with a tape measure and some simple high school math. Measure from centerline of crank to timing tab, call this dimension R. Then 2 x R x 3.14 / 360 = distance for one degree. Compared to the timing tab markings this should tell you exactly what is going on :-)
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