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What should my timing be set at?
#1
I am trying to find out what the timing should be set at on my 73, 351 Cleveland 2V,(stock motor). All my shop books says to refer to my valve cover sticker, but it is gone. Thanks for any help.
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#2
I believe it's 6* BTDC for the 2v motor and auto tranny.

-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

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#3
That's what I originally thought as well, but after reading some of the threads on distributors and tuning, I've discovered that my '71 is much happier with the timing set (without vacuum) at 16* BTDC. I'm running vacuum advance (not mechanical), for a total timing of something like 36* when higher up in the RPM range.

This is the thread where I learned the most: http://www.7173mustangs.com/thread-timin...=duraspark

Hope that helps.

Eric

[Image: mach1sig2.gif]
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#4
Mister 4x4;241433 Wrote:That's what I originally thought as well, but after reading some of the threads on distributors and tuning, I've discovered that my '71 is much happier with the timing set (without vacuum) at 16* BTDC. I'm running vacuum advance (not mechanical), for a total timing of something like 36* when higher up in the RPM range.

This is the thread where I learned the most: http://www.7173mustangs.com/thread-timin...=duraspark

Hope that helps.

I saw that the 351C 4V version was listed at 16* BTDC. I am running 14* right now with 34* at 2500 rpm with my 4V motor. I have been contemplating trying 16* though to see how it runs at that timing setting.

Eric, what's your compression, that may be the diff with the 1973 2V motor and the cam timing changes for emissions for that year.

-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

  Reply
#5
Because you have a stock "smogged" engine it won't react the same as earlier engines. I would start with 6° BTDC and see how it runs and make sure it doesn't ping. If everything is OK I would advance it a couple of degrees at a time and try it again. If it doesn't run alright retard it a couple of degrees at a time until it does.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#6
I just went out and checked the timing data on my original motor and it has 16* BTDC at 800 rpm in drive for the CJ version in 1973.

-john
(jbojo)
351C 4V cc heads, 10.5 : 1 CR, 290 Herbert cam, Flat top forged pistons, forged connecting rods, Atomic efi,
C6 with Gear Vendor overdrive, 3.89 Tru Trac, Hooker Super Comp with 2 1/2" Pypes Exhaust.        

Some Mod pictures can be seen at:

  Reply
#7
york0060;241430 Wrote:I am trying to find out what the timing should be set at on my 73, 351 Cleveland 2V,(stock motor). All my shop books says to refer to my valve cover sticker, but it is gone. Thanks for any help.

I just set mine this weekend, the engine is stock other than the new ignition and it has all the smog equip still. I added a pertronix drop in ignition and the timing was completely off afterwards. I set it at 10 degrees idle (with the vacuum plugged off) and then it was around 37 degrees at high rpm. Runs like a champ now!

71 Sportsroof 351c 2v bone-stock....sofar. Working 8-Track player!
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#8
I have a 73 with 351c 2v. My sticker is still on the valve cover. I will check it at lunch today and let you know what it says.
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#9
jbojo;241436 Wrote:I saw that the 351C 4V version was listed at 16* BTDC. I am running 14* right now with 34* at 2500 rpm with my 4V motor. I have been contemplating trying 16* though to see how it runs at that timing setting.

Eric, what's your compression, that may be the diff with the 1973 2V motor and the cam timing changes for emissions for that year.

Mine's originally a 2V, but now it's running 9.5:1 with lots of "go faster goodies," so there's not all that much "original" left in my engine. Cool

Eric

[Image: mach1sig2.gif]
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#10
Per the sticker on my valve cover. 6 degrees BTDC. 73 351c 2v.
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