396 timing - Team Camaro Tech
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post #1 of 28 (permalink) Old Jun 18th, 15, 03:09 PM Thread Starter
DT
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396 timing

Finally getting around to timing my engine. What are you guys using for timing on your 396 ? Just curious. I started out 12 initial, 34 total.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #2 of 28 (permalink) Old Jun 18th, 15, 07:00 PM
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Re: 396 timing

I do it the old fashion way and power tune it by ear. Bring it up to about 3500 move the distributor till you hit the sweet spot and then back off just a little. The car runs great and starts easy . If it turns over slow retard it some, works every time for me
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post #3 of 28 (permalink) Old Jun 18th, 15, 08:09 PM
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Re: 396 timing

Back then we could get away with timing by ear, that was when gas was good quality and better octane. Detonation will destroy an engine. Big blocks like timing, you can get away with 36-38 total but will have to listen for detonation and check plugs for metal specks. What is the compression ratio? Cast heads or aluminum?
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post #4 of 28 (permalink) Old Jun 19th, 15, 06:36 PM Thread Starter
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Re: 396 timing

Aluminum heads 9.75 to 1 compression, thanks for the replies.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #5 of 28 (permalink) Old Jun 19th, 15, 08:45 PM
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Re: 396 timing

I run mine with 18 initial & 36 total all in by 2500rpm.
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post #6 of 28 (permalink) Old Jun 20th, 15, 04:28 AM Thread Starter
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Re: 396 timing

Thx Nick

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #7 of 28 (permalink) Old Jun 20th, 15, 05:42 AM
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Doug
 
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Re: 396 timing

What are the specs. on your camshaft. Did you measure the quench and what is the thickness of your head gaskets. What distributor are you using? Finally are you running a 4 speed or automatic transmission?
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post #8 of 28 (permalink) Old Jun 20th, 15, 06:08 AM Thread Starter
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Re: 396 timing

DUI dizzy, 4 speed,
cam specs: duration @ .050 229/235
LIFT .585/.585
LSA 110
INT C/L 106

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #9 of 28 (permalink) Old Jun 20th, 15, 11:41 AM
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Re: 396 timing

Quote:
Originally Posted by DT View Post
DUI dizzy, 4 speed,
cam specs: duration @ .050 229/235
LIFT .585/.585
LSA 110
INT C/L 106
What vacuum advance can are you running ? Your combo should have about 12" vacuum at idle.

Be sure the can is fully advanced below the idle vacuum.

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post #10 of 28 (permalink) Old Jun 20th, 15, 12:47 PM
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Re: 396 timing

Drat! I was hoping to help out. Oh well. But wait! Here's how the factory said to do it on mine.

One owner 69 Camaro,(yep, bought it new
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post #11 of 28 (permalink) Old Jun 20th, 15, 02:26 PM Thread Starter
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Re: 396 timing

Quote:
Originally Posted by Lawrence454 View Post
What vacuum advance can are you running ? Your combo should have about 12" vacuum at idle.

Be sure the can is fully advanced below the idle vacuum.
No vacuum advance.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #12 of 28 (permalink) Old Jun 20th, 15, 05:38 PM
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Re: 396 timing

You realize you will catch some grief for no vacuum advance... I run mine locked at 36 and pull timing back under boost(my ignition turns back timing when starting). A proper vac advance really is best but without one you will need to run as much initial as you can and max out at 36. If you can run a really small amount of mechanical advance that would be best. You can run it locked like me but having a start retard will be your starters friend. Or an ignition kill switch, let it spin without spark and then let go of the kill.
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post #13 of 28 (permalink) Old Jun 20th, 15, 09:03 PM
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Re: 396 timing

Quote:
Originally Posted by Fred Ficarra View Post
Drat! I was hoping to help out. Oh well. But wait! Here's how the factory said to do it on mine.
After all of these years I finally find the right instructions !

Government's first duty is to protect the people, not run their lives.
Ronald Reagan
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post #14 of 28 (permalink) Old Jun 21st, 15, 12:25 PM
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Re: 396 timing

Quote:
Originally Posted by Lawrence454 View Post
After all of these years I finally find the right instructions !
Did you see the 4 in red at the bottom? That's initial. There is not a missing digit in front of it. Can you imagine timing a BBC with 4 initial?

One owner 69 Camaro,(yep, bought it new
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RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe. 3700 lbs. with me in it.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
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post #15 of 28 (permalink) Old Jun 21st, 15, 04:25 PM Thread Starter
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Re: 396 timing

Quote:
Originally Posted by bigblockragtop View Post
You realize you will catch some grief for no vacuum advance... I run mine locked at 36 and pull timing back under boost(my ignition turns back timing when starting). A proper vac advance really is best but without one you will need to run as much initial as you can and max out at 36. If you can run a really small amount of mechanical advance that would be best. You can run it locked like me but having a start retard will be your starters friend. Or an ignition kill switch, let it spin without spark and then let go of the kill.
Yes I know regarding the vacuum advance. My DUI has 22* in by 3,000. I think I will set my initial at 14* then. I'm currently at 12 initial 34 total.

Thx

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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