Timing an unknown cam engine - 460 Ford Forum
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post #1 of 9 (permalink) Old 10-28-2006, 04:53 PM Thread Starter
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Timing an unknown cam engine

I bought a 1979 truck with a 460 it has an aftermarket cam but I have no idea what it is , HOW can I time the engine without causing problems

When you think your ready, Check everything One more time, Then Double check your work.
Error equation: 5 min = 5 hours
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post #2 of 9 (permalink) Old 10-28-2006, 05:25 PM
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Ignition timing?

Are you talking about ignition timing? If so, you set ignition timing like any other engine...start small, work your way up. 15ish initial, 25ish total, work your way up listening critically detonation under load.

If you're talking about cam timing, you can make some assumptions and just time it straight-up; or you could measure it with a dial indicator and make some judgements that way.

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post #3 of 9 (permalink) Old 10-28-2006, 06:57 PM Thread Starter
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Yes Ignition timing, so 15* advance?

When you think your ready, Check everything One more time, Then Double check your work.
Error equation: 5 min = 5 hours
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post #4 of 9 (permalink) Old 10-28-2006, 07:01 PM Thread Starter
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Another Issue !!! The distributor cap is labeled with a #1 and the wire goes to cyl #5 (Right front when facing engine) is it poss that they changed the firing order with the cam they put in it?

When you think your ready, Check everything One more time, Then Double check your work.
Error equation: 5 min = 5 hours
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post #5 of 9 (permalink) Old 10-28-2006, 07:34 PM Thread Starter
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The standard firing order is 1,5,4,2,6,3,7,8 according to the dist cap marking it is firing 5,4,2,6,3,7,8,1 ??
Any Insight on this??

When I use the timing light on either # 1 or # 5 cyl the readings are off the chart

When you think your ready, Check everything One more time, Then Double check your work.
Error equation: 5 min = 5 hours
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post #6 of 9 (permalink) Old 10-28-2006, 07:43 PM Thread Starter
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That is the firing order for a Non Ford Block,
But It IS a ford 460

When you think your ready, Check everything One more time, Then Double check your work.
Error equation: 5 min = 5 hours
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post #7 of 9 (permalink) Old 10-28-2006, 08:08 PM
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Somebody installed the distributor one cylinder off and was too lazy to correct it. They just moved the wires over one terminal all the way around.
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post #8 of 9 (permalink) Old 10-29-2006, 12:45 PM
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The one thing not mentioned here is...

...proper distributor curve.

For most mild 460 combos with D3 heads and low compression 14 to 16 degrees intitial and 34 to 38 degrees total in by 2800 to 3 k RPM works quite nicely.

As suggested in another post start conservatively and sneak up on it.

Here is a link to my website with instructions for recurving the ford duraspark distributor. This is very important for best performance and economy. The factory curve is emissions oriented and the aftermarket remanned distributors are hit and miss so far as the curve is concerned.

http://www.reincarnation-automotive....ons_index.html




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post #9 of 9 (permalink) Old 10-30-2006, 07:09 PM Thread Starter
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If the dist. was improperly installed then I should still be able to use cyl 1 for timing. isnt that correct?

When you think your ready, Check everything One more time, Then Double check your work.
Error equation: 5 min = 5 hours
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