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HELP !!! Where is 6 degrees BTC on a L69?

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Old Jun 27, 2012 | 03:14 PM
  #1  
Chuck84TA's Avatar
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Joined: May 2012
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From: Woodstock, IL
Car: 1984 Trans Am Recaro Edition
Engine: 355 L98 Vortec 226/234 custom cam
Transmission: TKO-600
Axle/Gears: On borrowed time...
HELP !!! Where is 6 degrees BTC on a L69?

Trying to set the timing on my L69. I noticed with the timing light that there are 4 to 5 (hard to tell, kind of dirty down there in the crankcase) triangular blade shapes. Which one do I shoot for? I cannot see any numbers associated with the triangles. The white painted line on the groove is clearly visible.

I already heard about the finger int he spark plug hole method, but I'd rather do it with the timing light...Spent some $$$ on the light, you know...like to think its useful.

Chuck
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Old Jun 27, 2012 | 03:21 PM
  #2  
Apeiron's Avatar
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Joined: Jan 2000
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: HELP !!! Where is 6 degrees BTC on a L69?

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Old Jun 27, 2012 | 04:55 PM
  #3  
Chuck84TA's Avatar
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Senior Member
 
Joined: May 2012
Posts: 582
Likes: 1
From: Woodstock, IL
Car: 1984 Trans Am Recaro Edition
Engine: 355 L98 Vortec 226/234 custom cam
Transmission: TKO-600
Axle/Gears: On borrowed time...
Re: HELP !!! Where is 6 degrees BTC on a L69?

Thanks!

Chuck
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Old Jun 27, 2012 | 05:25 PM
  #4  
ASE doc's Avatar
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Joined: Apr 2010
Posts: 4,337
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From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: HELP !!! Where is 6 degrees BTC on a L69?

That's a great picture. Interesting that it shows 6 degrees at the 10 degree mark. Of course, 10 degrees is generally a better setting for stock TPI than the OE 6 degrees.
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Old Jun 27, 2012 | 07:23 PM
  #5  
BrownBullet83Z's Avatar
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Joined: Nov 2010
Posts: 52
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From: Worcester, MA
Car: '83 Camaro Z28
Engine: "Just a little something"
Transmission: T-5
Axle/Gears: 3:73
Re: HELP !!! Where is 6 degrees BTC on a L69?

Thanks for saying that ASE! I was thinking the same thing and was going to post but you beat me to it. It is odd!
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