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afr reading on motor. How much timing to take out?

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Old Sep 1, 2008 | 12:42 AM
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From: kissimmee fl
Car: 88 iroc-z z-28
Engine: 383
Transmission: th400
Axle/Gears: 3.42
afr reading on motor. How much timing to take out?

Hey guys i have a issue before I actually spray my motor.

I have my afr readings in high gear at 13.6-13.8.

My compression ratio is 11:1 on 93 octane.

Full advance is 39* on aluminum heads.

I have a msd digital plus with a nitrous retard. What im getting to is how much should i retard timing for say a ~100shot?

I was thinking 4*, but i thought maybe a tad bit more because of my motor afrs? Im also going to richen the 2 back jets on the carb.,
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